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cogl-pipeline-glsl: Don't use gl_PointCoord on OpenGL

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We don't want to use gl_PointCoord to implement point sprites on big
GL because in that case we already use glTexEnv(GL_COORD_REPLACE) to
replace the texture coords with the point sprite coords. Although GL
also supports the gl_PointCoord variable, it requires GLSL 1.2 which
would mean we would have to declare the GLSL version and check for
it. We continue to use gl_PointCoord for GLES2 because it has no
glTexEnv function.
This commit is contained in:
Neil Roberts 2010-11-24 15:30:56 +00:00
parent c50cb72748
commit cda5ea771b
1 changed files with 8 additions and 1 deletions
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9
cogl/cogl-pipeline-glsl.c
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@ -533,13 +533,20 @@ add_texture_lookup (GlslProgramState *glsl_program_state,
/* If point sprite coord generation is being used then divert to the
built-in varying var for that instead of the texture
coordinates */
coordinates. We don't want to do this under GL because in that
case we will instead use glTexEnv(GL_COORD_REPLACE) to replace
the texture coords with the point sprite coords. Although GL also
supports the gl_PointCoord variable, it requires GLSL 1.2 which
would mean we would have to declare the GLSL version and check
for it */
#ifdef HAVE_COGL_GLES2
if (cogl_pipeline_get_layer_point_sprite_coords_enabled (pipeline,
layer->index))
g_string_append_printf (glsl_program_state->source,
"gl_PointCoord.%s",
tex_coord_swizzle);
else
#endif
g_string_append_printf (glsl_program_state->source,
"cogl_tex_coord_in[%d].%s",
unit_index, tex_coord_swizzle);