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cogl-material: Fallback to BlendFunc if BlendFuncSeparate is unavailable

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glBlendFuncSeparate is only available in OpenGL 1.4. If we
conditionally check for this then Clutter will work with OpenGL 1.2.

http://bugzilla.openedhand.com/show_bug.cgi?id=1875
This commit is contained in:
Neil Roberts 2009-11-11 13:38:52 +00:00
parent a50907848f
commit 6b0b07a8a6
1 changed files with 8 additions and 3 deletions
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11
cogl/cogl-material.c
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@ -1546,16 +1546,21 @@ _cogl_material_flush_base_gl_state (CoglMaterial *material,
{ {
#if defined (HAVE_COGL_GLES2) #if defined (HAVE_COGL_GLES2)
gboolean have_blend_equation_seperate = TRUE; gboolean have_blend_equation_seperate = TRUE;
gboolean have_blend_func_separate = TRUE;
#elif defined (HAVE_COGL_GL) #elif defined (HAVE_COGL_GL)
gboolean have_blend_equation_seperate = FALSE; gboolean have_blend_equation_seperate = FALSE;
gboolean have_blend_func_separate = FALSE;
if (ctx->drv.pf_glBlendEquationSeparate) /* Only GL 2.0 + */ if (ctx->drv.pf_glBlendEquationSeparate) /* Only GL 2.0 + */
have_blend_equation_seperate = TRUE; have_blend_equation_seperate = TRUE;
if (ctx->drv.pf_glBlendFuncSeparate) /* Only GL 1.4 + */
have_blend_func_separate = TRUE;
#endif #endif
#ifndef HAVE_COGL_GLES /* GLES 1 only has glBlendFunc */ #ifndef HAVE_COGL_GLES /* GLES 1 only has glBlendFunc */
if (material->blend_src_factor_rgb != material->blend_src_factor_alpha if (have_blend_func_separate &&
|| (material->blend_src_factor_rgb != (material->blend_src_factor_rgb != material->blend_src_factor_alpha ||
material->blend_src_factor_alpha)) (material->blend_src_factor_rgb !=
material->blend_src_factor_alpha)))
{ {
if (have_blend_equation_seperate && if (have_blend_equation_seperate &&
material->blend_equation_rgb != material->blend_equation_alpha) material->blend_equation_rgb != material->blend_equation_alpha)