3881fd3259
This adds experimental 2.0 api replacements for the cogl_rectangle[_*]
functions that don't depend on having a current pipeline set on the
context via cogl_{set,push}_source() or having a current framebuffer set
on the context via cogl_push_framebuffer(). The aim for 2.0 is to switch
away from having a statefull context that affects drawing to having
framebuffer drawing apis that are explicitly passed a framebuffer and
pipeline.
To test this change several of the conformance tests were updated to use
this api instead of cogl_rectangle and
cogl_rectangle_with_texture_coords. Since it's quite laborious going
through all of the conformance tests the opportunity was taken to make
other clean ups in the conformance tests to replace other uses of
1.x api with experimental 2.0 api so long as that didn't affect what was
being tested.
309 lines
9.1 KiB
C
309 lines
9.1 KiB
C
#include <cogl/cogl.h>
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#include <string.h>
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#include "test-utils.h"
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/* Size the texture so that it is just off a power of two to encourage
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it so use software tiling when NPOTs aren't available */
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#define TEXTURE_SIZE 257
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/* Amount of pixels to skip off the top, bottom, left and right of the
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texture when reading back the stage */
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#define TEST_INSET 2
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/* Size to actually render the texture at */
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#define TEXTURE_RENDER_SIZE 8
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typedef struct _TestState
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{
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CoglTexture *texture;
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CoglFramebuffer *offscreen;
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CoglTexture *offscreen_tex;
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int width, height;
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} TestState;
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static void
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validate_part (CoglFramebuffer *framebuffer,
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int xnum, int ynum, gboolean shown)
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{
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test_utils_check_region (framebuffer,
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xnum * TEXTURE_RENDER_SIZE + TEST_INSET,
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ynum * TEXTURE_RENDER_SIZE + TEST_INSET,
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TEXTURE_RENDER_SIZE - TEST_INSET * 2,
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TEXTURE_RENDER_SIZE - TEST_INSET * 2,
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shown ? 0xff0000ff : 0x000000ff);
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}
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/* We draw everything 16 times. The draw number is used as a bitmask
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to test all of the combinations of enabling legacy state, both
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winding orders and all four culling modes */
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#define USE_LEGACY_STATE(draw_num) (((draw_num) & 0x01) >> 0)
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#define FRONT_WINDING(draw_num) (((draw_num) & 0x02) >> 1)
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#define CULL_FACE_MODE(draw_num) (((draw_num) & 0x0c) >> 2)
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static void
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paint_test_backface_culling (TestState *state,
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CoglFramebuffer *framebuffer)
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{
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int draw_num;
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CoglPipeline *base_pipeline = cogl_pipeline_new (ctx);
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cogl_framebuffer_orthographic (framebuffer,
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0, 0,
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state->width,
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state->height,
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-1,
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100);
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cogl_framebuffer_clear4f (framebuffer,
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COGL_BUFFER_BIT_COLOR | COGL_BUFFER_BIT_STENCIL,
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0, 0, 0, 1);
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cogl_pipeline_set_layer_texture (base_pipeline, 0, state->texture);
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cogl_pipeline_set_layer_filters (base_pipeline, 0,
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COGL_PIPELINE_FILTER_NEAREST,
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COGL_PIPELINE_FILTER_NEAREST);
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cogl_push_framebuffer (framebuffer);
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/* Render the scene sixteen times to test all of the combinations of
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cull face mode, legacy state and winding orders */
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for (draw_num = 0; draw_num < 16; draw_num++)
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{
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float x1 = 0, x2, y1 = 0, y2 = (float)(TEXTURE_RENDER_SIZE);
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CoglTextureVertex verts[4];
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CoglPipeline *pipeline;
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cogl_push_matrix ();
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cogl_translate (0, TEXTURE_RENDER_SIZE * draw_num, 0);
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pipeline = cogl_pipeline_copy (base_pipeline);
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cogl_set_backface_culling_enabled (USE_LEGACY_STATE (draw_num));
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cogl_pipeline_set_front_face_winding (pipeline, FRONT_WINDING (draw_num));
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cogl_pipeline_set_cull_face_mode (pipeline, CULL_FACE_MODE (draw_num));
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cogl_push_source (pipeline);
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memset (verts, 0, sizeof (verts));
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x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
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/* Draw a front-facing texture */
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cogl_rectangle (x1, y1, x2, y2);
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x1 = x2;
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x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
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/* Draw a front-facing texture with flipped texcoords */
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cogl_rectangle_with_texture_coords (x1, y1, x2, y2,
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1.0, 0.0, 0.0, 1.0);
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x1 = x2;
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x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
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/* Draw a back-facing texture */
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cogl_rectangle (x2, y1, x1, y2);
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x1 = x2;
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x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
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/* If the texture is sliced then cogl_polygon doesn't work so
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we'll just use a solid color instead */
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if (cogl_texture_is_sliced (state->texture))
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cogl_set_source_color4ub (255, 0, 0, 255);
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/* Draw a front-facing polygon */
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verts[0].x = x1; verts[0].y = y2;
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verts[1].x = x2; verts[1].y = y2;
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verts[2].x = x2; verts[2].y = y1;
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verts[3].x = x1; verts[3].y = y1;
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verts[0].tx = 0; verts[0].ty = 0;
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verts[1].tx = 1.0; verts[1].ty = 0;
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verts[2].tx = 1.0; verts[2].ty = 1.0;
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verts[3].tx = 0; verts[3].ty = 1.0;
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cogl_polygon (verts, 4, FALSE);
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x1 = x2;
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x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
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/* Draw a back-facing polygon */
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verts[0].x = x1; verts[0].y = y1;
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verts[1].x = x2; verts[1].y = y1;
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verts[2].x = x2; verts[2].y = y2;
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verts[3].x = x1; verts[3].y = y2;
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verts[0].tx = 0; verts[0].ty = 0;
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verts[1].tx = 1.0; verts[1].ty = 0;
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verts[2].tx = 1.0; verts[2].ty = 1.0;
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verts[3].tx = 0; verts[3].ty = 1.0;
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cogl_polygon (verts, 4, FALSE);
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x1 = x2;
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x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
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cogl_pop_matrix ();
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cogl_pop_source ();
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cogl_object_unref (pipeline);
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}
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cogl_pop_framebuffer ();
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cogl_object_unref (base_pipeline);
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}
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static void
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validate_result (CoglFramebuffer *framebuffer, int y_offset)
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{
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int draw_num;
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for (draw_num = 0; draw_num < 16; draw_num++)
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{
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gboolean cull_front, cull_back;
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CoglPipelineCullFaceMode cull_mode;
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if (USE_LEGACY_STATE (draw_num))
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cull_mode = COGL_PIPELINE_CULL_FACE_MODE_BACK;
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else
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cull_mode = CULL_FACE_MODE (draw_num);
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switch (cull_mode)
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{
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case COGL_PIPELINE_CULL_FACE_MODE_NONE:
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cull_front = FALSE;
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cull_back = FALSE;
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break;
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case COGL_PIPELINE_CULL_FACE_MODE_FRONT:
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cull_front = TRUE;
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cull_back = FALSE;
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break;
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case COGL_PIPELINE_CULL_FACE_MODE_BACK:
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cull_front = FALSE;
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cull_back = TRUE;
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break;
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case COGL_PIPELINE_CULL_FACE_MODE_BOTH:
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cull_front = TRUE;
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cull_back = TRUE;
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break;
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}
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if (FRONT_WINDING (draw_num) == COGL_WINDING_CLOCKWISE)
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{
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gboolean tmp = cull_front;
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cull_front = cull_back;
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cull_back = tmp;
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}
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/* Front-facing texture */
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validate_part (framebuffer,
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0, y_offset + draw_num, !cull_front);
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/* Front-facing texture with flipped tex coords */
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validate_part (framebuffer,
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1, y_offset + draw_num, !cull_front);
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/* Back-facing texture */
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validate_part (framebuffer,
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2, y_offset + draw_num, !cull_back);
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/* Front-facing texture polygon */
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validate_part (framebuffer,
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3, y_offset + draw_num, !cull_front);
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/* Back-facing texture polygon */
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validate_part (framebuffer,
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4, y_offset + draw_num, !cull_back);
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}
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}
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static void
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paint (TestState *state)
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{
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CoglPipeline *pipeline;
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paint_test_backface_culling (state, fb);
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/*
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* Now repeat the test but rendered to an offscreen
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* framebuffer. Note that by default the conformance tests are
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* always run to an offscreen buffer but we might as well have this
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* check anyway in case it is being run with COGL_TEST_ONSCREEN=1
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*/
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paint_test_backface_culling (state, state->offscreen);
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/* Copy the result of the offscreen rendering for validation and
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* also so we can have visual feedback. */
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pipeline = cogl_pipeline_new (ctx);
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cogl_pipeline_set_layer_texture (pipeline, 0, state->offscreen_tex);
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cogl_framebuffer_draw_rectangle (fb,
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pipeline,
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0, TEXTURE_RENDER_SIZE * 16,
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state->width,
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state->height + TEXTURE_RENDER_SIZE * 16);
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cogl_object_unref (pipeline);
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validate_result (fb, 0);
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validate_result (fb, 16);
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}
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static CoglTexture *
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make_texture (void)
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{
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guchar *tex_data, *p;
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CoglTexture *tex;
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tex_data = g_malloc (TEXTURE_SIZE * TEXTURE_SIZE * 4);
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for (p = tex_data + TEXTURE_SIZE * TEXTURE_SIZE * 4; p > tex_data;)
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{
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*(--p) = 255;
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*(--p) = 0;
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*(--p) = 0;
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*(--p) = 255;
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}
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tex = cogl_texture_new_from_data (TEXTURE_SIZE,
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TEXTURE_SIZE,
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COGL_TEXTURE_NO_ATLAS,
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COGL_PIXEL_FORMAT_RGBA_8888,
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COGL_PIXEL_FORMAT_ANY,
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TEXTURE_SIZE * 4,
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tex_data);
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g_free (tex_data);
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return tex;
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}
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void
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test_backface_culling (void)
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{
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TestState state;
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CoglTexture *tex;
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state.width = cogl_framebuffer_get_width (fb);
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state.height = cogl_framebuffer_get_height (fb);
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state.offscreen = NULL;
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state.texture = make_texture ();
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tex = cogl_texture_new_with_size (state.width, state.height,
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COGL_TEXTURE_NO_SLICING,
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COGL_PIXEL_FORMAT_ANY); /* internal fmt */
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state.offscreen = COGL_FRAMEBUFFER (cogl_offscreen_new_to_texture (tex));
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state.offscreen_tex = tex;
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paint (&state);
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cogl_object_unref (state.offscreen);
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cogl_object_unref (state.offscreen_tex);
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cogl_object_unref (state.texture);
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if (cogl_test_verbose ())
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g_print ("OK\n");
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}
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