gles2: Honor alpha in fragment_src_external
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
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@ -90,7 +90,7 @@ static void init_default_shaders() {
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goto error;
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}
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if (glEGLImageTargetTexture2DOES) {
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if (!compile_program(quad_vertex_src, fragment_src_external,
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if (!compile_program(vertex_src, fragment_src_external,
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&shaders.external)) {
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goto error;
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}
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@ -80,8 +80,9 @@ const GLchar fragment_src_external[] =
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"precision mediump float;"
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"varying vec2 v_texcoord;"
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"uniform samplerExternalOES texture0;"
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"uniform float alpha;"
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""
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"void main() {"
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" vec4 col = texture2D(texture0, v_texcoord);"
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" gl_FragColor = vec4(col.rgb, col.a);"
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" gl_FragColor = vec4(col.rgb, col.a * alpha);"
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"}";
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