/* * Clutter COGL * * A basic GL/GLES Abstraction/Utility Layer * * Authored By Matthew Allum * * Copyright (C) 2007 OpenedHand * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include "config.h" #include "cogl.h" #include #include #if G_BYTE_ORDER == G_LITTLE_ENDIAN #define PIXEL_TYPE GL_UNSIGNED_BYTE #else #define PIXEL_TYPE GL_UNSIGNED_INT_8_8_8_8_REV #endif static gulong __enable_flags = 0; #define COGL_DEBUG 0 #if COGL_DEBUG struct token_string { GLuint Token; const char *String; }; static const struct token_string Errors[] = { { GL_NO_ERROR, "no error" }, { GL_INVALID_ENUM, "invalid enumerant" }, { GL_INVALID_VALUE, "invalid value" }, { GL_INVALID_OPERATION, "invalid operation" }, { GL_STACK_OVERFLOW, "stack overflow" }, { GL_STACK_UNDERFLOW, "stack underflow" }, { GL_OUT_OF_MEMORY, "out of memory" }, #ifdef GL_INVALID_FRAMEBUFFER_OPERATION_EXT { GL_INVALID_FRAMEBUFFER_OPERATION_EXT, "invalid framebuffer operation" }, #endif { ~0, NULL } }; static const char* error_string(GLenum errorCode) { int i; for (i = 0; Errors[i].String; i++) { if (Errors[i].Token == errorCode) return Errors[i].String; } return "unknown"; } #endif #if COGL_DEBUG #define GE(x...) { \ GLenum err; \ (x); \ fprintf(stderr, "%s\n", #x); \ while ((err = glGetError()) != GL_NO_ERROR) { \ fprintf(stderr, "glError: %s caught at %s:%u\n", \ (char *)error_string(err), \ __FILE__, __LINE__); \ } \ } #else #define GE(x) (x); #endif CoglFuncPtr cogl_get_proc_address (const gchar* name) { return NULL; } gboolean cogl_check_extension (const gchar *name, const gchar *ext) { return FALSE; } void cogl_paint_init (const ClutterColor *color) { #if COGL_DEBUG fprintf(stderr, "\n ============== Paint Start ================ \n"); #endif glClearColorx ((color->red << 16) / 0xff, (color->green << 16) / 0xff, (color->blue << 16) / 0xff, 0xff); glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); glDisable (GL_LIGHTING); glDisable (GL_DEPTH_TEST); cogl_enable (CGL_ENABLE_BLEND); glTexEnvx (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); } /* FIXME: inline most of these */ void cogl_push_matrix (void) { GE( glPushMatrix() ); } void cogl_pop_matrix (void) { GE( glPopMatrix() ); } void cogl_scale (ClutterFixed x, ClutterFixed y) { GE( glScalex (x, y, CFX_ONE) ); } void cogl_translatex (ClutterFixed x, ClutterFixed y, ClutterFixed z) { GE( glTranslatex (x, y, z) ); } void cogl_translate (gint x, gint y, gint z) { GE( glTranslatex (CLUTTER_INT_TO_FIXED(x), CLUTTER_INT_TO_FIXED(y), CLUTTER_INT_TO_FIXED(z)) ); } void cogl_rotatex (ClutterFixed angle, ClutterFixed x, ClutterFixed y, ClutterFixed z) { GE( glRotatex (angle,x,y,z) ); } void cogl_rotate (gint angle, gint x, gint y, gint z) { GE( glRotatex (CLUTTER_INT_TO_FIXED(angle), CLUTTER_INT_TO_FIXED(x), CLUTTER_INT_TO_FIXED(y), CLUTTER_INT_TO_FIXED(z)) ); } void cogl_enable (gulong flags) { /* This function essentially caches glEnable state() in the * hope of lessening number GL traffic. */ if (flags & CGL_ENABLE_BLEND) { if (!(__enable_flags & CGL_ENABLE_BLEND)) { GE( glEnable (GL_BLEND) ); GE( glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ); } __enable_flags |= CGL_ENABLE_BLEND; } else if (__enable_flags & CGL_ENABLE_BLEND) { GE( glDisable (GL_BLEND) ); __enable_flags &= ~CGL_ENABLE_BLEND; } if (flags & CGL_ENABLE_TEXTURE_2D) { if (!(__enable_flags & CGL_ENABLE_TEXTURE_2D)) GE( glEnable (GL_TEXTURE_2D) ); __enable_flags |= CGL_ENABLE_TEXTURE_2D; } else if (__enable_flags & CGL_ENABLE_TEXTURE_2D) { GE( glDisable (GL_TEXTURE_2D) ); __enable_flags &= ~CGL_ENABLE_TEXTURE_2D; } #if 0 if (flags & CGL_ENABLE_TEXTURE_RECT) { if (!(__enable_flags & CGL_ENABLE_TEXTURE_RECT)) glEnable (GL_TEXTURE_RECTANGLE_ARB); __enable_flags |= CGL_ENABLE_TEXTURE_RECT; } else if (__enable_flags & CGL_ENABLE_TEXTURE_RECT) { glDisable (GL_TEXTURE_RECTANGLE_ARB); __enable_flags &= ~CGL_ENABLE_TEXTURE_RECT; } #endif if (flags & CGL_ENABLE_ALPHA_TEST) { if (!(__enable_flags & CGL_ENABLE_ALPHA_TEST)) glEnable (GL_ALPHA_TEST); __enable_flags |= CGL_ENABLE_ALPHA_TEST; } else if (__enable_flags & CGL_ENABLE_ALPHA_TEST) { glDisable (GL_ALPHA_TEST); __enable_flags &= ~CGL_ENABLE_ALPHA_TEST; } } void cogl_color (const ClutterColor *color) { GE( glColor4x ((color->red << 16) / 0xff, (color->green << 16) / 0xff, (color->blue << 16) / 0xff, (color->alpha << 16) / 0xff) ); } void cogl_clip_set (const ClutterGeometry *clip) { GE( glEnable (GL_STENCIL_TEST) ); GE( glClearStencil (0) ); GE( glClear (GL_STENCIL_BUFFER_BIT) ); GE( glStencilFunc (GL_NEVER, 0x1, 0x1) ); GE( glStencilOp (GL_INCR, GL_INCR, GL_INCR) ); GE( glColor4x (CFX_ONE, CFX_ONE, CFX_ONE, CFX_ONE ) ); cogl_rectangle (clip->x, clip->y, clip->width, clip->height); GE( glStencilFunc (GL_EQUAL, 0x1, 0x1) ); GE( glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP) ); } void cogl_clip_unset (void) { GE( glDisable (GL_STENCIL_TEST) ); } gboolean cogl_texture_can_size (COGLenum pixel_format, COGLenum pixel_type, int width, int height) { /* FIXME */ return TRUE; #if 0 GLint new_width = 0; GE( glTexImage2D (GL_PROXY_TEXTURE_2D, 0, GL_RGBA, width, height, 0 /* border */, pixel_format, pixel_type, NULL) ); GE( glGetTexLevelParameteriv (GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &new_width) ); return new_width != 0; #endif } void cogl_texture_quad (gint x1, gint x2, gint y1, gint y2, ClutterFixed tx1, ClutterFixed ty1, ClutterFixed tx2, ClutterFixed ty2) { #define FIX CLUTTER_INT_TO_FIXED GLfixed quadVerts[] = { FIX(x1), FIX(y1), 0, FIX(x2), FIX(y1), 0, FIX(x2), FIX(y2), 0, FIX(x2), FIX(y2), 0, FIX(x1), FIX(y2), 0, FIX(x1), FIX(y1), 0 }; GLfixed quadTex[] = { tx1, ty1, tx2, ty1, tx2, ty2, tx2, ty2, tx1, ty2, tx1, ty1 }; #undef FIX GE( glEnableClientState(GL_VERTEX_ARRAY) ); GE( glEnableClientState(GL_TEXTURE_COORD_ARRAY) ); GE( glVertexPointer(3, GL_FIXED, 0, quadVerts) ); GE( glTexCoordPointer(2, GL_FIXED, 0, quadTex) ); GE( glDrawArrays(GL_TRIANGLES, 0, 6) ); GE( glDisableClientState(GL_TEXTURE_COORD_ARRAY) ); GE( glDisableClientState(GL_VERTEX_ARRAY) ); } void cogl_textures_create (guint num, guint *textures) { GE( glGenTextures (num, textures) ); } void cogl_textures_destroy (guint num, const guint *textures) { GE( glDeleteTextures (num, textures) ); } void cogl_texture_bind (COGLenum target, guint texture) { GE( glBindTexture (target, texture) ); } void cogl_texture_set_alignment (COGLenum target, guint alignment, guint row_length) { /* GE( glPixelStorei (GL_UNPACK_ROW_LENGTH, row_length) ); */ GE( glPixelStorei (GL_UNPACK_ALIGNMENT, alignment) ); } void cogl_texture_set_filters (COGLenum target, COGLenum min_filter, COGLenum max_filter) { GE( glTexParameteri(target, GL_TEXTURE_MAG_FILTER, max_filter) ); GE( glTexParameteri(target, GL_TEXTURE_MIN_FILTER, min_filter) ); } void cogl_texture_set_wrap (COGLenum target, COGLenum wrap_s, COGLenum wrap_t) { GE( glTexParameteri(target, GL_TEXTURE_WRAP_S, wrap_s) ); GE( glTexParameteri(target, GL_TEXTURE_WRAP_T, wrap_s) ); } void cogl_texture_image_2d (COGLenum target, COGLint internal_format, gint width, gint height, COGLenum format, COGLenum type, const guchar* pixels) { GE( glTexImage2D (target, 0, /* No mipmap support as yet */ internal_format, width, height, 0, /* 0 pixel border */ format, type, pixels) ); } void cogl_texture_sub_image_2d (COGLenum target, gint xoff, gint yoff, gint width, gint height, COGLenum format, COGLenum type, const guchar* pixels) { GE( glTexSubImage2D (target, 0, xoff, yoff, width, height, format, type, pixels)); } void cogl_rectangle (gint x, gint y, guint width, guint height) { #define FIX CLUTTER_INT_TO_FIXED GLfixed rect_verts[] = { FIX(x), FIX(y), FIX((x + width)), FIX(y), FIX(x), FIX((y + height)), FIX((x + width)), FIX((y + height)), }; #undef FIX GE( glEnableClientState(GL_VERTEX_ARRAY) ); GE( glVertexPointer(2, GL_FIXED, 0, rect_verts) ); GE( glDrawArrays(GL_TRIANGLE_STRIP, 0, 4) ); GE( glDisableClientState(GL_VERTEX_ARRAY) ); } /* FIXME: Should use ClutterReal or Fixed */ void cogl_trapezoid (gint y1, gint x11, gint x21, gint y2, gint x12, gint x22) { /* FIXME */ } void cogl_alpha_func (COGLenum func, ClutterFixed ref) { GE( glAlphaFunc (func, CLUTTER_FIXED_TO_FLOAT(ref)) ); } /* * Fixed point implementation of the perspective function */ void cogl_perspective (ClutterAngle fovy, ClutterFixed aspect, ClutterFixed zNear, ClutterFixed zFar) { ClutterFixed xmax, ymax; ClutterFixed x, y, c, d; GLfixed m[16]; memset (&m[0], 0, sizeof (m)); /* * Based on the original algorithm in perspective(): * * 1) xmin = -xmax => xmax + xmin == 0 && xmax - xmin == 2 * xmax * same true for y, hence: a == 0 && b == 0; * * 2) When working with small numbers, we can are loosing significant * precision, hence we use clutter_qmulx() here, not the fast macro. */ ymax = clutter_qmulx (zNear, clutter_tani (fovy >> 1)); xmax = clutter_qmulx (ymax, aspect); x = CFX_DIV (zNear, xmax); y = CFX_DIV (zNear, ymax); c = CFX_DIV (-(zFar + zNear), ( zFar - zNear)); d = CFX_DIV (-(clutter_qmulx (2*zFar, zNear)), (zFar - zNear)); #define M(row,col) m[col*4+row] M(0,0) = x; M(1,1) = y; M(2,2) = c; M(2,3) = d; M(3,2) = 1 + ~CFX_ONE; GE( glMultMatrixx (m) ); #undef M } void cogl_setup_viewport (guint w, guint h, ClutterAngle fovy, ClutterFixed aspect, ClutterFixed z_near, ClutterFixed z_far) { gint width = (gint) w; gint height = (gint) h; ClutterFixed z_camera; GE( glViewport (0, 0, width, height) ); GE( glMatrixMode (GL_PROJECTION) ); GE( glLoadIdentity () ); /* For Ortho projection. * glOrthox (0, width << 16, 0, height << 16, -1 << 16, 1 << 16); */ cogl_perspective (fovy, aspect, z_near, z_far); GE( glMatrixMode (GL_MODELVIEW) ); GE( glLoadIdentity () ); /* camera distance from screen, 0.5 * tan (FOV) */ #define DEFAULT_Z_CAMERA 0.866025404f z_camera = clutter_tani (fovy) >> 1; GE( glTranslatex (-1 << 15, -1 << 15, -z_camera)); GE( glScalex ( CFX_ONE / width, -CFX_ONE / height, CFX_ONE / width)); GE( glTranslatex (0, -CFX_ONE * height, 0) ); } ClutterFeatureFlags cogl_get_features () { /* Suck */ return 0; }