2012-04-19 13:28:50 +00:00
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/*
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* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Ported to GLES2.
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* Kristian Høgsberg <krh@bitplanet.net>
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* May 3, 2010
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*
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* Improve GLES2 port:
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* * Refactor gear drawing.
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* * Use correct normals for surfaces.
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* * Improve shader.
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* * Use perspective projection transformation.
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* * Add FPS count.
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* * Add comments.
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* Alexandros Frantzis <alexandros.frantzis@linaro.org>
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* Jul 13, 2010
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*/
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#define GL_GLEXT_PROTOTYPES
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#include <math.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <GLES2/gl2.h>
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#include <cogl/cogl.h>
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#include <cogl/cogl-gles2.h>
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#include <glib.h>
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#define STRIPS_PER_TOOTH 7
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#define VERTICES_PER_TOOTH 34
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#define GEAR_VERTEX_STRIDE 6
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typedef struct _Data
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{
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CoglContext *ctx;
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CoglFramebuffer *fb;
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CoglGLES2Context *gles2_ctx;
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GTimer *timer;
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int frames;
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double last_elapsed;
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} Data;
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/**
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* Struct describing the vertices in triangle strip
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*/
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struct vertex_strip {
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/** The first vertex in the strip */
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GLint first;
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/** The number of consecutive vertices in the strip after the first */
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GLint count;
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};
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/* Each vertex consist of GEAR_VERTEX_STRIDE GLfloat attributes */
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typedef GLfloat GearVertex[GEAR_VERTEX_STRIDE];
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/**
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* Struct representing a gear.
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*/
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struct gear {
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/** The array of vertices comprising the gear */
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GearVertex *vertices;
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/** The number of vertices comprising the gear */
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int nvertices;
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/** The array of triangle strips comprising the gear */
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struct vertex_strip *strips;
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/** The number of triangle strips comprising the gear */
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int nstrips;
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/** The Vertex Buffer Object holding the vertices in the graphics card */
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GLuint vbo;
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};
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/** The view rotation [x, y, z] */
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static GLfloat view_rot[3] = { 20.0, 30.0, 0.0 };
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/** The gears */
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static struct gear *gear1, *gear2, *gear3;
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/** The current gear rotation angle */
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static GLfloat angle = 0.0;
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/** The location of the shader uniforms */
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static GLuint ModelViewProjectionMatrix_location,
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NormalMatrix_location,
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LightSourcePosition_location,
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MaterialColor_location;
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/** The projection matrix */
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static GLfloat ProjectionMatrix[16];
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/** The direction of the directional light for the scene */
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static const GLfloat LightSourcePosition[4] = { 5.0, 5.0, 10.0, 1.0};
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/**
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* Fills a gear vertex.
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*
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* @param v the vertex to fill
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* @param x the x coordinate
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* @param y the y coordinate
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* @param z the z coortinate
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* @param n pointer to the normal table
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*
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* @return the operation error code
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*/
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static GearVertex *
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vert (GearVertex *v, GLfloat x, GLfloat y, GLfloat z, GLfloat n[3])
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{
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v[0][0] = x;
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v[0][1] = y;
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v[0][2] = z;
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v[0][3] = n[0];
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v[0][4] = n[1];
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v[0][5] = n[2];
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return v + 1;
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}
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/**
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* Create a gear wheel.
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*
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* @param inner_radius radius of hole at center
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* @param outer_radius radius at center of teeth
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* @param width width of gear
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* @param teeth number of teeth
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* @param tooth_depth depth of tooth
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*
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* @return pointer to the constructed struct gear
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*/
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static struct gear *
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create_gear (GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
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GLint teeth, GLfloat tooth_depth)
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{
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GLfloat r0, r1, r2;
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GLfloat da;
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GearVertex *v;
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struct gear *gear;
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double s[5], c[5];
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GLfloat normal[3];
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int cur_strip = 0;
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int i;
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/* Allocate memory for the gear */
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gear = malloc (sizeof *gear);
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if (gear == NULL)
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return NULL;
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/* Calculate the radii used in the gear */
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r0 = inner_radius;
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r1 = outer_radius - tooth_depth / 2.0;
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r2 = outer_radius + tooth_depth / 2.0;
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da = 2.0 * M_PI / teeth / 4.0;
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/* Allocate memory for the triangle strip information */
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gear->nstrips = STRIPS_PER_TOOTH * teeth;
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gear->strips = calloc (gear->nstrips, sizeof (*gear->strips));
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/* Allocate memory for the vertices */
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gear->vertices = calloc (VERTICES_PER_TOOTH * teeth, sizeof(*gear->vertices));
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v = gear->vertices;
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for (i = 0; i < teeth; i++) {
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/* Calculate needed sin/cos for varius angles */
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sincos (i * 2.0 * M_PI / teeth, &s[0], &c[0]);
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sincos (i * 2.0 * M_PI / teeth + da, &s[1], &c[1]);
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sincos (i * 2.0 * M_PI / teeth + da * 2, &s[2], &c[2]);
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sincos (i * 2.0 * M_PI / teeth + da * 3, &s[3], &c[3]);
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sincos (i * 2.0 * M_PI / teeth + da * 4, &s[4], &c[4]);
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/* A set of macros for making the creation of the gears easier */
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#define GEAR_POINT(r, da) { (r) * c[(da)], (r) * s[(da)] }
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#define SET_NORMAL(x, y, z) do { \
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normal[0] = (x); normal[1] = (y); normal[2] = (z); \
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} while(0)
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#define GEAR_VERT(v, point, sign) vert((v), p[(point)].x, p[(point)].y, (sign) * width * 0.5, normal)
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#define START_STRIP do { \
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gear->strips[cur_strip].first = v - gear->vertices; \
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} while(0);
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#define END_STRIP do { \
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int _tmp = (v - gear->vertices); \
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gear->strips[cur_strip].count = _tmp - gear->strips[cur_strip].first; \
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cur_strip++; \
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} while (0)
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#define QUAD_WITH_NORMAL(p1, p2) do { \
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SET_NORMAL((p[(p1)].y - p[(p2)].y), -(p[(p1)].x - p[(p2)].x), 0); \
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v = GEAR_VERT(v, (p1), -1); \
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v = GEAR_VERT(v, (p1), 1); \
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v = GEAR_VERT(v, (p2), -1); \
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v = GEAR_VERT(v, (p2), 1); \
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} while(0)
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{
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struct point {
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GLfloat x;
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GLfloat y;
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};
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/* Create the 7 points (only x,y coords) used to draw a tooth */
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struct point p[7] = {
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GEAR_POINT (r2, 1), // 0
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GEAR_POINT (r2, 2), // 1
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GEAR_POINT (r1, 0), // 2
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GEAR_POINT (r1, 3), // 3
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GEAR_POINT (r0, 0), // 4
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GEAR_POINT (r1, 4), // 5
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GEAR_POINT (r0, 4), // 6
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};
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/* Front face */
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START_STRIP;
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SET_NORMAL (0, 0, 1.0);
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v = GEAR_VERT (v, 0, +1);
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v = GEAR_VERT (v, 1, +1);
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v = GEAR_VERT (v, 2, +1);
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v = GEAR_VERT (v, 3, +1);
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v = GEAR_VERT (v, 4, +1);
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v = GEAR_VERT (v, 5, +1);
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v = GEAR_VERT (v, 6, +1);
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END_STRIP;
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/* Inner face */
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START_STRIP;
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QUAD_WITH_NORMAL (4, 6);
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END_STRIP;
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/* Back face */
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START_STRIP;
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SET_NORMAL (0, 0, -1.0);
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v = GEAR_VERT (v, 6, -1);
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v = GEAR_VERT (v, 5, -1);
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v = GEAR_VERT (v, 4, -1);
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v = GEAR_VERT (v, 3, -1);
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v = GEAR_VERT (v, 2, -1);
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v = GEAR_VERT (v, 1, -1);
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v = GEAR_VERT (v, 0, -1);
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END_STRIP;
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/* Outer face */
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START_STRIP;
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QUAD_WITH_NORMAL (0, 2);
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END_STRIP;
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START_STRIP;
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QUAD_WITH_NORMAL (1, 0);
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END_STRIP;
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START_STRIP;
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QUAD_WITH_NORMAL (3, 1);
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END_STRIP;
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START_STRIP;
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QUAD_WITH_NORMAL (5, 3);
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END_STRIP;
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}
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}
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gear->nvertices = (v - gear->vertices);
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/* Store the vertices in a vertex buffer object (VBO) */
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glGenBuffers (1, &gear->vbo);
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glBindBuffer (GL_ARRAY_BUFFER, gear->vbo);
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glBufferData (GL_ARRAY_BUFFER, gear->nvertices * sizeof(GearVertex),
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gear->vertices, GL_STATIC_DRAW);
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return gear;
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}
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/**
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* Multiplies two 4x4 matrices.
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*
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* The result is stored in matrix m.
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*
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* @param m the first matrix to multiply
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* @param n the second matrix to multiply
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*/
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static void
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multiply (GLfloat *m, const GLfloat *n)
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{
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GLfloat tmp[16];
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const GLfloat *row, *column;
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div_t d;
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int i, j;
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for (i = 0; i < 16; i++) {
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tmp[i] = 0;
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d = div(i, 4);
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row = n + d.quot * 4;
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column = m + d.rem;
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for (j = 0; j < 4; j++)
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tmp[i] += row[j] * column[j * 4];
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}
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memcpy (m, &tmp, sizeof tmp);
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}
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/**
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* Rotates a 4x4 matrix.
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*
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* @param[in,out] m the matrix to rotate
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* @param angle the angle to rotate
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* @param x the x component of the direction to rotate to
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* @param y the y component of the direction to rotate to
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* @param z the z component of the direction to rotate to
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*/
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static void
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rotate (GLfloat *m, GLfloat angle, GLfloat x, GLfloat y, GLfloat z)
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{
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double s, c;
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sincos (angle, &s, &c);
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{
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GLfloat r[16] = {
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x * x * (1 - c) + c, y * x * (1 - c) + z * s, x * z * (1 - c) - y * s, 0,
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x * y * (1 - c) - z * s, y * y * (1 - c) + c, y * z * (1 - c) + x * s, 0,
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x * z * (1 - c) + y * s, y * z * (1 - c) - x * s, z * z * (1 - c) + c, 0,
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0, 0, 0, 1
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};
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multiply (m, r);
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}
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}
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/**
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* Translates a 4x4 matrix.
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*
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* @param[in,out] m the matrix to translate
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* @param x the x component of the direction to translate to
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* @param y the y component of the direction to translate to
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* @param z the z component of the direction to translate to
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*/
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static void
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translate(GLfloat *m, GLfloat x, GLfloat y, GLfloat z)
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{
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GLfloat t[16] = { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, x, y, z, 1 };
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multiply (m, t);
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}
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/**
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* Creates an identity 4x4 matrix.
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*
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* @param m the matrix make an identity matrix
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*/
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static void
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identity (GLfloat *m)
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{
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GLfloat t[16] = {
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|
|
1.0, 0.0, 0.0, 0.0,
|
|
|
|
0.0, 1.0, 0.0, 0.0,
|
|
|
|
0.0, 0.0, 1.0, 0.0,
|
|
|
|
0.0, 0.0, 0.0, 1.0,
|
|
|
|
};
|
|
|
|
|
|
|
|
memcpy (m, t, sizeof(t));
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Transposes a 4x4 matrix.
|
|
|
|
*
|
|
|
|
* @param m the matrix to transpose
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
transpose (GLfloat *m)
|
|
|
|
{
|
|
|
|
GLfloat t[16] = {
|
|
|
|
m[0], m[4], m[8], m[12],
|
|
|
|
m[1], m[5], m[9], m[13],
|
|
|
|
m[2], m[6], m[10], m[14],
|
|
|
|
m[3], m[7], m[11], m[15]};
|
|
|
|
|
|
|
|
memcpy (m, t, sizeof(t));
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Inverts a 4x4 matrix.
|
|
|
|
*
|
|
|
|
* This function can currently handle only pure translation-rotation matrices.
|
|
|
|
* Read http://www.gamedev.net/community/forums/topic.asp?topic_id=425118
|
|
|
|
* for an explanation.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
invert (GLfloat *m)
|
|
|
|
{
|
|
|
|
GLfloat t[16];
|
|
|
|
identity (t);
|
|
|
|
|
|
|
|
// Extract and invert the translation part 't'. The inverse of a
|
|
|
|
// translation matrix can be calculated by negating the translation
|
|
|
|
// coordinates.
|
|
|
|
t[12] = -m[12]; t[13] = -m[13]; t[14] = -m[14];
|
|
|
|
|
|
|
|
// Invert the rotation part 'r'. The inverse of a rotation matrix is
|
|
|
|
// equal to its transpose.
|
|
|
|
m[12] = m[13] = m[14] = 0;
|
|
|
|
transpose (m);
|
|
|
|
|
|
|
|
// inv (m) = inv (r) * inv (t)
|
|
|
|
multiply (m, t);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Calculate a perspective projection transformation.
|
|
|
|
*
|
|
|
|
* @param m the matrix to save the transformation in
|
|
|
|
* @param fovy the field of view in the y direction
|
|
|
|
* @param aspect the view aspect ratio
|
|
|
|
* @param zNear the near clipping plane
|
|
|
|
* @param zFar the far clipping plane
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
perspective (GLfloat *m, GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar)
|
|
|
|
{
|
|
|
|
GLfloat tmp[16];
|
|
|
|
double sine, cosine, cotangent, deltaZ;
|
|
|
|
GLfloat radians = fovy / 2 * M_PI / 180;
|
|
|
|
|
|
|
|
identity (tmp);
|
|
|
|
|
|
|
|
deltaZ = zFar - zNear;
|
|
|
|
sincos (radians, &sine, &cosine);
|
|
|
|
|
|
|
|
if ((deltaZ == 0) || (sine == 0) || (aspect == 0))
|
|
|
|
return;
|
|
|
|
|
|
|
|
cotangent = cosine / sine;
|
|
|
|
|
|
|
|
tmp[0] = cotangent / aspect;
|
|
|
|
tmp[5] = cotangent;
|
|
|
|
tmp[10] = -(zFar + zNear) / deltaZ;
|
|
|
|
tmp[11] = -1;
|
|
|
|
tmp[14] = -2 * zNear * zFar / deltaZ;
|
|
|
|
tmp[15] = 0;
|
|
|
|
|
|
|
|
memcpy (m, tmp, sizeof(tmp));
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Draws a gear.
|
|
|
|
*
|
|
|
|
* @param gear the gear to draw
|
|
|
|
* @param transform the current transformation matrix
|
|
|
|
* @param x the x position to draw the gear at
|
|
|
|
* @param y the y position to draw the gear at
|
|
|
|
* @param angle the rotation angle of the gear
|
|
|
|
* @param color the color of the gear
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
draw_gear (struct gear *gear, GLfloat *transform,
|
|
|
|
GLfloat x, GLfloat y, GLfloat angle, const GLfloat color[4])
|
|
|
|
{
|
|
|
|
GLfloat model_view[16];
|
|
|
|
GLfloat normal_matrix[16];
|
|
|
|
GLfloat model_view_projection[16];
|
|
|
|
int n;
|
|
|
|
|
|
|
|
/* Translate and rotate the gear */
|
|
|
|
memcpy(model_view, transform, sizeof (model_view));
|
|
|
|
translate(model_view, x, y, 0);
|
|
|
|
rotate(model_view, 2 * M_PI * angle / 360.0, 0, 0, 1);
|
|
|
|
|
|
|
|
/* Create and set the ModelViewProjectionMatrix */
|
|
|
|
memcpy (model_view_projection,
|
|
|
|
ProjectionMatrix,
|
|
|
|
sizeof(model_view_projection));
|
|
|
|
multiply (model_view_projection, model_view);
|
|
|
|
|
|
|
|
glUniformMatrix4fv (ModelViewProjectionMatrix_location, 1, GL_FALSE,
|
|
|
|
model_view_projection);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Create and set the NormalMatrix. It's the inverse transpose of the
|
|
|
|
* ModelView matrix.
|
|
|
|
*/
|
|
|
|
memcpy (normal_matrix, model_view, sizeof (normal_matrix));
|
|
|
|
invert (normal_matrix);
|
|
|
|
transpose (normal_matrix);
|
|
|
|
glUniformMatrix4fv (NormalMatrix_location, 1, GL_FALSE, normal_matrix);
|
|
|
|
|
|
|
|
/* Set the gear color */
|
|
|
|
glUniform4fv (MaterialColor_location, 1, color);
|
|
|
|
|
|
|
|
/* Set the vertex buffer object to use */
|
|
|
|
glBindBuffer (GL_ARRAY_BUFFER, gear->vbo);
|
|
|
|
|
|
|
|
/* Set up the position of the attributes in the vertex buffer object */
|
|
|
|
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE,
|
|
|
|
6 * sizeof(GLfloat), NULL);
|
|
|
|
glVertexAttribPointer (1, 3, GL_FLOAT, GL_FALSE,
|
|
|
|
6 * sizeof(GLfloat), (GLfloat *) 0 + 3);
|
|
|
|
|
|
|
|
/* Enable the attributes */
|
|
|
|
glEnableVertexAttribArray (0);
|
|
|
|
glEnableVertexAttribArray (1);
|
|
|
|
|
|
|
|
/* Draw the triangle strips that comprise the gear */
|
|
|
|
for (n = 0; n < gear->nstrips; n++)
|
|
|
|
glDrawArrays (GL_TRIANGLE_STRIP,
|
|
|
|
gear->strips[n].first,
|
|
|
|
gear->strips[n].count);
|
|
|
|
|
|
|
|
/* Disable the attributes */
|
|
|
|
glDisableVertexAttribArray (1);
|
|
|
|
glDisableVertexAttribArray (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Draws the gears.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
gears_draw(void)
|
|
|
|
{
|
|
|
|
const static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
|
|
|
|
const static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
|
|
|
|
const static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
|
|
|
|
GLfloat transform[16];
|
|
|
|
identity(transform);
|
|
|
|
|
|
|
|
glClearColor (0.0, 0.0, 0.0, 0.0);
|
|
|
|
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
|
|
|
|
|
|
/* Translate and rotate the view */
|
|
|
|
translate (transform, 0, 0, -20);
|
|
|
|
rotate (transform, 2 * M_PI * view_rot[0] / 360.0, 1, 0, 0);
|
|
|
|
rotate (transform, 2 * M_PI * view_rot[1] / 360.0, 0, 1, 0);
|
|
|
|
rotate (transform, 2 * M_PI * view_rot[2] / 360.0, 0, 0, 1);
|
|
|
|
|
|
|
|
/* Draw the gears */
|
|
|
|
draw_gear (gear1, transform, -3.0, -2.0, angle, red);
|
|
|
|
draw_gear (gear2, transform, 3.1, -2.0, -2 * angle - 9.0, green);
|
|
|
|
draw_gear (gear3, transform, -3.1, 4.2, -2 * angle - 25.0, blue);
|
|
|
|
}
|
|
|
|
|
|
|
|
static gboolean
|
|
|
|
paint_cb (void *user_data)
|
|
|
|
{
|
|
|
|
Data *data = user_data;
|
|
|
|
double elapsed = g_timer_elapsed (data->timer, NULL);
|
|
|
|
double dt = elapsed - data->last_elapsed;
|
2012-08-31 18:28:27 +00:00
|
|
|
CoglError *error = NULL;
|
2012-04-19 13:28:50 +00:00
|
|
|
|
|
|
|
/* Draw scene with GLES2 */
|
|
|
|
if (!cogl_push_gles2_context (data->ctx,
|
|
|
|
data->gles2_ctx,
|
|
|
|
data->fb,
|
|
|
|
data->fb,
|
|
|
|
&error))
|
|
|
|
{
|
|
|
|
g_error ("Failed to push gles2 context: %s\n", error->message);
|
|
|
|
}
|
|
|
|
|
|
|
|
gears_draw ();
|
|
|
|
|
|
|
|
cogl_pop_gles2_context (data->ctx);
|
|
|
|
|
|
|
|
cogl_onscreen_swap_buffers (COGL_ONSCREEN (data->fb));
|
|
|
|
|
|
|
|
/* advance rotation for next frame */
|
|
|
|
angle += 70.0 * dt; /* 70 degrees per second */
|
|
|
|
if (angle > 3600.0)
|
|
|
|
angle -= 3600.0;
|
|
|
|
|
|
|
|
data->frames++;
|
|
|
|
|
|
|
|
if (elapsed > 5.0) {
|
|
|
|
GLfloat fps = data->frames / elapsed;
|
|
|
|
printf ("%d frames in %3.1f seconds = %6.3f FPS\n",
|
|
|
|
data->frames, elapsed, fps);
|
|
|
|
g_timer_reset (data->timer);
|
|
|
|
data->last_elapsed = 0;
|
|
|
|
data->frames = 0;
|
|
|
|
}else
|
|
|
|
data->last_elapsed = elapsed;
|
|
|
|
|
2013-01-29 16:08:36 +00:00
|
|
|
return FALSE; /* remove the callback */
|
2012-04-19 13:28:50 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
2013-01-29 16:08:36 +00:00
|
|
|
frame_event_cb (CoglOnscreen *onscreen,
|
|
|
|
CoglFrameEvent event,
|
|
|
|
CoglFrameInfo *info,
|
|
|
|
void *user_data)
|
2012-04-19 13:28:50 +00:00
|
|
|
{
|
2013-02-15 16:51:11 +00:00
|
|
|
if (event == COGL_FRAME_EVENT_SYNC)
|
|
|
|
paint_cb (user_data);
|
2012-04-19 13:28:50 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Handles a new window size or exposure.
|
|
|
|
*
|
|
|
|
* @param width the window width
|
|
|
|
* @param height the window height
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
gears_reshape (int width, int height)
|
|
|
|
{
|
|
|
|
/* Update the projection matrix */
|
|
|
|
perspective (ProjectionMatrix, 60.0, width / (float)height, 1.0, 1024.0);
|
|
|
|
|
|
|
|
/* Set the viewport */
|
|
|
|
glViewport (0, 0, (GLint) width, (GLint) height);
|
|
|
|
}
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
/**
|
|
|
|
* Handles special eglut events.
|
|
|
|
*
|
|
|
|
* @param special the event to handle.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
gears_special(int special)
|
|
|
|
{
|
|
|
|
switch (special) {
|
|
|
|
case EGLUT_KEY_LEFT:
|
|
|
|
view_rot[1] += 5.0;
|
|
|
|
break;
|
|
|
|
case EGLUT_KEY_RIGHT:
|
|
|
|
view_rot[1] -= 5.0;
|
|
|
|
break;
|
|
|
|
case EGLUT_KEY_UP:
|
|
|
|
view_rot[0] += 5.0;
|
|
|
|
break;
|
|
|
|
case EGLUT_KEY_DOWN:
|
|
|
|
view_rot[0] -= 5.0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static const char vertex_shader[] =
|
|
|
|
"attribute vec3 position;\n"
|
|
|
|
"attribute vec3 normal;\n"
|
|
|
|
"\n"
|
|
|
|
"uniform mat4 ModelViewProjectionMatrix;\n"
|
|
|
|
"uniform mat4 NormalMatrix;\n"
|
|
|
|
"uniform vec4 LightSourcePosition;\n"
|
|
|
|
"uniform vec4 MaterialColor;\n"
|
|
|
|
"\n"
|
|
|
|
"varying vec4 Color;\n"
|
|
|
|
"\n"
|
|
|
|
"void main(void)\n"
|
|
|
|
"{\n"
|
|
|
|
" // Transform the normal to eye coordinates\n"
|
|
|
|
" vec3 N = normalize(vec3(NormalMatrix * vec4(normal, 1.0)));\n"
|
|
|
|
"\n"
|
|
|
|
" // The LightSourcePosition is actually its direction for directional light\n"
|
|
|
|
" vec3 L = normalize(LightSourcePosition.xyz);\n"
|
|
|
|
"\n"
|
|
|
|
" // Multiply the diffuse value by the vertex color (which is fixed in this case)\n"
|
|
|
|
" // to get the actual color that we will use to draw this vertex with\n"
|
|
|
|
" float diffuse = max(dot(N, L), 0.0);\n"
|
|
|
|
" Color = diffuse * MaterialColor;\n"
|
|
|
|
"\n"
|
|
|
|
" // Transform the position to clip coordinates\n"
|
|
|
|
" gl_Position = ModelViewProjectionMatrix * vec4(position, 1.0);\n"
|
|
|
|
"}";
|
|
|
|
|
|
|
|
static const char fragment_shader[] =
|
|
|
|
"precision mediump float;\n"
|
|
|
|
"varying vec4 Color;\n"
|
|
|
|
"\n"
|
|
|
|
"void main(void)\n"
|
|
|
|
"{\n"
|
|
|
|
" gl_FragColor = Color;\n"
|
|
|
|
"}";
|
|
|
|
|
|
|
|
static void
|
|
|
|
gears_init(void)
|
|
|
|
{
|
|
|
|
GLuint v, f, program;
|
|
|
|
const char *p;
|
|
|
|
char msg[512];
|
|
|
|
|
|
|
|
glEnable (GL_CULL_FACE);
|
|
|
|
glEnable (GL_DEPTH_TEST);
|
|
|
|
|
|
|
|
/* Compile the vertex shader */
|
|
|
|
p = vertex_shader;
|
|
|
|
v = glCreateShader (GL_VERTEX_SHADER);
|
|
|
|
glShaderSource (v, 1, &p, NULL);
|
|
|
|
glCompileShader (v);
|
|
|
|
glGetShaderInfoLog (v, sizeof msg, NULL, msg);
|
|
|
|
printf ("vertex shader info: %s\n", msg);
|
|
|
|
|
|
|
|
/* Compile the fragment shader */
|
|
|
|
p = fragment_shader;
|
|
|
|
f = glCreateShader (GL_FRAGMENT_SHADER);
|
|
|
|
glShaderSource (f, 1, &p, NULL);
|
|
|
|
glCompileShader (f);
|
|
|
|
glGetShaderInfoLog (f, sizeof msg, NULL, msg);
|
|
|
|
printf ("fragment shader info: %s\n", msg);
|
|
|
|
|
|
|
|
/* Create and link the shader program */
|
|
|
|
program = glCreateProgram ();
|
|
|
|
glAttachShader (program, v);
|
|
|
|
glAttachShader (program, f);
|
|
|
|
glBindAttribLocation (program, 0, "position");
|
|
|
|
glBindAttribLocation (program, 1, "normal");
|
|
|
|
|
|
|
|
glLinkProgram (program);
|
|
|
|
glGetProgramInfoLog (program, sizeof msg, NULL, msg);
|
|
|
|
printf ("info: %s\n", msg);
|
|
|
|
|
|
|
|
/* Enable the shaders */
|
|
|
|
glUseProgram (program);
|
|
|
|
|
|
|
|
/* Get the locations of the uniforms so we can access them */
|
|
|
|
ModelViewProjectionMatrix_location =
|
|
|
|
glGetUniformLocation (program, "ModelViewProjectionMatrix");
|
|
|
|
NormalMatrix_location =
|
|
|
|
glGetUniformLocation (program, "NormalMatrix");
|
|
|
|
LightSourcePosition_location =
|
|
|
|
glGetUniformLocation (program, "LightSourcePosition");
|
|
|
|
MaterialColor_location =
|
|
|
|
glGetUniformLocation (program, "MaterialColor");
|
|
|
|
|
|
|
|
/* Set the LightSourcePosition uniform which is constant throughout
|
|
|
|
* the program */
|
|
|
|
glUniform4fv (LightSourcePosition_location, 1, LightSourcePosition);
|
|
|
|
|
|
|
|
/* make the gears */
|
|
|
|
gear1 = create_gear (1.0, 4.0, 1.0, 20, 0.7);
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|
|
|
gear2 = create_gear (0.5, 2.0, 2.0, 10, 0.7);
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|
|
|
gear3 = create_gear (1.3, 2.0, 0.5, 10, 0.7);
|
|
|
|
}
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|
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|
|
|
int
|
|
|
|
main (int argc, char **argv)
|
|
|
|
{
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|
|
|
Data data;
|
|
|
|
CoglOnscreen *onscreen;
|
2012-08-31 18:28:27 +00:00
|
|
|
CoglError *error = NULL;
|
2012-04-19 13:28:50 +00:00
|
|
|
GSource *cogl_source;
|
|
|
|
GMainLoop *loop;
|
2012-04-26 11:18:56 +00:00
|
|
|
CoglRenderer *renderer;
|
|
|
|
CoglDisplay *display;
|
|
|
|
|
|
|
|
renderer = cogl_renderer_new ();
|
|
|
|
cogl_renderer_add_constraint (renderer,
|
|
|
|
COGL_RENDERER_CONSTRAINT_SUPPORTS_COGL_GLES2);
|
|
|
|
display = cogl_display_new (renderer, NULL);
|
|
|
|
data.ctx = cogl_context_new (display, NULL);
|
2012-04-19 13:28:50 +00:00
|
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|
|
|
|
|
onscreen = cogl_onscreen_new (data.ctx, 300, 300);
|
|
|
|
cogl_onscreen_show (onscreen);
|
|
|
|
data.fb = COGL_FRAMEBUFFER (onscreen);
|
|
|
|
|
|
|
|
data.gles2_ctx = cogl_gles2_context_new (data.ctx, &error);
|
|
|
|
if (!data.gles2_ctx)
|
|
|
|
g_error ("Failed to create GLES2 context: %s\n", error->message);
|
|
|
|
|
|
|
|
/* Draw scene with GLES2 */
|
|
|
|
if (!cogl_push_gles2_context (data.ctx,
|
|
|
|
data.gles2_ctx,
|
|
|
|
data.fb,
|
|
|
|
data.fb,
|
|
|
|
&error))
|
|
|
|
{
|
|
|
|
g_error ("Failed to push gles2 context: %s\n", error->message);
|
|
|
|
}
|
|
|
|
|
|
|
|
gears_reshape (cogl_framebuffer_get_width (data.fb),
|
|
|
|
cogl_framebuffer_get_height (data.fb));
|
|
|
|
|
|
|
|
/* Initialize the gears */
|
|
|
|
gears_init();
|
|
|
|
|
|
|
|
cogl_pop_gles2_context (data.ctx);
|
|
|
|
|
|
|
|
cogl_source = cogl_glib_source_new (data.ctx, G_PRIORITY_DEFAULT);
|
|
|
|
|
|
|
|
g_source_attach (cogl_source, NULL);
|
|
|
|
|
2013-01-29 16:08:36 +00:00
|
|
|
cogl_onscreen_add_frame_callback (COGL_ONSCREEN (data.fb),
|
|
|
|
frame_event_cb,
|
|
|
|
&data,
|
|
|
|
NULL); /* destroy notify */
|
2012-04-19 13:28:50 +00:00
|
|
|
|
|
|
|
g_idle_add (paint_cb, &data);
|
|
|
|
|
|
|
|
data.timer = g_timer_new ();
|
|
|
|
data.frames = 0;
|
|
|
|
data.last_elapsed = 0;
|
|
|
|
|
|
|
|
loop = g_main_loop_new (NULL, TRUE);
|
|
|
|
g_main_loop_run (loop);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|