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gles2: Honor alpha in fragment_src_external

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By using the same vertex shader and adding alpha to the fragment shader
for external textures we can:

  - use alpha blending
  - have wlr_gles2_render_texture_with_matrix work with
    the GL_TEXTURE_EXTERNAL_OES. So far this failed
    since we passed in alpha which was unknown by fragment_src_external
This commit is contained in:
Guido Günther 2018-03-19 15:45:34 +01:00
parent 13e4ba4867
commit 2d01663b25
2 changed files with 3 additions and 2 deletions
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2
render/gles2/renderer.c
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@ -90,7 +90,7 @@ static void init_default_shaders() {
goto error; goto error;
} }
if (glEGLImageTargetTexture2DOES) { if (glEGLImageTargetTexture2DOES) {
if (!compile_program(quad_vertex_src, fragment_src_external, if (!compile_program(vertex_src, fragment_src_external,
&shaders.external)) { &shaders.external)) {
goto error; goto error;
} }

3
render/gles2/shaders.c
View file

@ -80,8 +80,9 @@ const GLchar fragment_src_external[] =
"precision mediump float;" "precision mediump float;"
"varying vec2 v_texcoord;" "varying vec2 v_texcoord;"
"uniform samplerExternalOES texture0;" "uniform samplerExternalOES texture0;"
"uniform float alpha;"
"" ""
"void main() {" "void main() {"
" vec4 col = texture2D(texture0, v_texcoord);" " vec4 col = texture2D(texture0, v_texcoord);"
" gl_FragColor = vec4(col.rgb, col.a);" " gl_FragColor = vec4(col.rgb, col.a * alpha);"
"}"; "}";