return shader;
}
+static std::string GenerateVertexShader(int layer_count) {
+ std::ostringstream vertex_shader_stream;
+ vertex_shader_stream
+ << "#version 300 es\n"
+ << "#define LAYER_COUNT " << layer_count << "\n"
+ << "precision mediump int;\n"
+ << "uniform vec4 uViewport;\n"
+ << "uniform vec4 uLayerCrop[LAYER_COUNT];\n"
+ << "uniform mat2 uTexMatrix[LAYER_COUNT];\n"
+ << "in vec2 vPosition;\n"
+ << "in vec2 vTexCoords;\n"
+ << "out vec2 fTexCoords[LAYER_COUNT];\n"
+ << "void main() {\n"
+ << " for (int i = 0; i < LAYER_COUNT; i++) {\n"
+ << " vec2 tempCoords = vTexCoords * uTexMatrix[i];\n"
+ << " fTexCoords[i] =\n"
+ << " uLayerCrop[i].xy + tempCoords * uLayerCrop[i].zw;\n"
+ << " }\n"
+ << " vec2 scaledPosition = uViewport.xy + vPosition * uViewport.zw;\n"
+ << " gl_Position =\n"
+ << " vec4(scaledPosition * vec2(2.0) - vec2(1.0), 0.0, 1.0);\n"
+ << "}\n";
+ return vertex_shader_stream.str();
+}
+
+static std::string GenerateFragmentShader(int layer_count) {
+ std::ostringstream fragment_shader_stream;
+ fragment_shader_stream << "#version 300 es\n"
+ << "#define LAYER_COUNT " << layer_count << "\n"
+ << "#extension GL_OES_EGL_image_external : require\n"
+ << "precision mediump float;\n";
+ for (int i = 0; i < layer_count; ++i) {
+ fragment_shader_stream << "uniform samplerExternalOES uLayerTexture" << i
+ << ";\n";
+ }
+ fragment_shader_stream << "uniform float uLayerAlpha[LAYER_COUNT];\n"
+ << "uniform float uLayerPremult[LAYER_COUNT];\n"
+ << "in vec2 fTexCoords[LAYER_COUNT];\n"
+ << "out vec4 oFragColor;\n"
+ << "void main() {\n"
+ << " vec3 color = vec3(0.0, 0.0, 0.0);\n"
+ << " float alphaCover = 1.0;\n"
+ << " vec4 texSample;\n"
+ << " vec3 multRgb;\n";
+ for (int i = 0; i < layer_count; ++i) {
+ if (i > 0)
+ fragment_shader_stream << " if (alphaCover > 0.5/255.0) {\n";
+ // clang-format off
+ fragment_shader_stream
+ << " texSample = texture2D(uLayerTexture" << i << ",\n"
+ << " fTexCoords[" << i << "]);\n"
+ << " multRgb = texSample.rgb *\n"
+ << " max(texSample.a, uLayerPremult[" << i << "]);\n"
+ << " color += multRgb * uLayerAlpha[" << i << "] * alphaCover;\n"
+ << " alphaCover *= 1.0 - texSample.a * uLayerAlpha[" << i << "];\n";
+ // clang-format on
+ }
+ for (int i = 0; i < layer_count - 1; ++i)
+ fragment_shader_stream << " }\n";
+ fragment_shader_stream << " oFragColor = vec4(color, 1.0 - alphaCover);\n"
+ << "}\n";
+ return fragment_shader_stream.str();
+}
+
static int GenerateShaders(std::vector<AutoGLProgram> *blend_programs) {
// Limits: GL_MAX_VARYING_COMPONENTS, GL_MAX_TEXTURE_IMAGE_UNITS,
// GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
- // clang-format off
- const GLchar *shader_preamble = "#version 300 es\n#define LAYER_COUNT ";
-
- const GLchar *vertex_shader_source =
-"\n"
-"precision mediump int; \n"
-"uniform vec4 uViewport; \n"
-"uniform vec4 uLayerCrop[LAYER_COUNT]; \n"
-"uniform mat2 uTexMatrix[LAYER_COUNT]; \n"
-"in vec2 vPosition; \n"
-"in vec2 vTexCoords; \n"
-"out vec2 fTexCoords[LAYER_COUNT]; \n"
-"void main() { \n"
-" for (int i = 0; i < LAYER_COUNT; i++) { \n"
-" vec2 tempCoords = vTexCoords * uTexMatrix[i]; \n"
-" fTexCoords[i] = uLayerCrop[i].xy + tempCoords * uLayerCrop[i].zw; \n"
-" } \n"
-" vec2 scaledPosition = uViewport.xy + vPosition * uViewport.zw; \n"
-" gl_Position = vec4(scaledPosition * vec2(2.0) - vec2(1.0), 0.0, 1.0); \n"
-"} \n";
-
- const GLchar *fragment_shader_source =
-"\n"
-"#extension GL_OES_EGL_image_external : require \n"
-"precision mediump float; \n"
-"uniform samplerExternalOES uLayerTextures[LAYER_COUNT]; \n"
-"uniform float uLayerAlpha[LAYER_COUNT]; \n"
-"in vec2 fTexCoords[LAYER_COUNT]; \n"
-"out vec4 oFragColor; \n"
-"void main() { \n"
-" vec3 color = vec3(0.0, 0.0, 0.0); \n"
-" float alphaCover = 1.0; \n"
-" for (int i = 0; i < LAYER_COUNT; i++) { \n"
-" vec4 texSample = texture2D(uLayerTextures[i], fTexCoords[i]); \n"
-" float a = texSample.a * uLayerAlpha[i]; \n"
-" color += a * alphaCover * texSample.rgb; \n"
-" alphaCover *= 1.0 - a; \n"
-" if (alphaCover <= 0.5/255.0) \n"
-" break; \n"
-" } \n"
-" oFragColor = vec4(color, 1.0 - alphaCover); \n"
-"} \n";
- // clang-format on
-
int i, ret = 1;
GLint max_texture_images, status;
AutoGLShader vertex_shader, fragment_shader;
glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &max_texture_images);
for (i = 1; i <= max_texture_images; i++) {
- std::ostringstream layer_count_formatter;
- layer_count_formatter << i;
- std::string layer_count(layer_count_formatter.str());
- const GLchar *shader_sources[3] = {shader_preamble, layer_count.c_str(),
- NULL};
-
- shader_sources[2] = vertex_shader_source;
- vertex_shader = CompileAndCheckShader(GL_VERTEX_SHADER, 3, shader_sources,
- ret ? &shader_log : NULL);
+ std::string vertex_shader_string = GenerateVertexShader(i);
+ const GLchar *vertex_shader_source = vertex_shader_string.c_str();
+ vertex_shader = CompileAndCheckShader(
+ GL_VERTEX_SHADER, 1, &vertex_shader_source, ret ? &shader_log : NULL);
if (!vertex_shader.get()) {
if (ret)
- ALOGE("Failed to make vertex shader:\n%s", shader_log.c_str());
+ ALOGE("Failed to make vertex shader:\n%sshader source:\n%s",
+ shader_log.c_str(), vertex_shader_source);
break;
}
- shader_sources[2] = fragment_shader_source;
- fragment_shader = CompileAndCheckShader(
- GL_FRAGMENT_SHADER, 3, shader_sources, ret ? &shader_log : NULL);
+ std::string fragment_shader_string = GenerateFragmentShader(i);
+ const GLchar *fragment_shader_source = fragment_shader_string.c_str();
+ fragment_shader =
+ CompileAndCheckShader(GL_FRAGMENT_SHADER, 1, &fragment_shader_source,
+ ret ? &shader_log : NULL);
if (!fragment_shader.get()) {
if (ret)
- ALOGE("Failed to make fragment shader:\n%s", shader_log.c_str());
+ ALOGE("Failed to make fragment shader:\n%sshader source:\n%s",
+ shader_log.c_str(), fragment_shader_source);
break;
}
unsigned texture_index;
float crop_bounds[4];
float alpha;
+ float premult;
float texture_matrix[4];
};
}
if (layer.blending == DrmHwcBlending::kNone) {
- src.alpha = 1.0f;
+ src.alpha = src.premult = 1.0f;
// This layer is opaque. There is no point in using layers below this
// one.
break;
}
src.alpha = layer.alpha / 255.0f;
+ src.premult =
+ (layer.blending == DrmHwcBlending::kPreMult) ? 1.0f : 0.0f;
}
}
}
GLint program = blend_programs_[cmd.texture_count - 1].get();
glUseProgram(program);
GLint gl_viewport_loc = glGetUniformLocation(program, "uViewport");
- GLint gl_tex_loc = glGetUniformLocation(program, "uLayerTextures");
GLint gl_crop_loc = glGetUniformLocation(program, "uLayerCrop");
GLint gl_alpha_loc = glGetUniformLocation(program, "uLayerAlpha");
+ GLint gl_premult_loc = glGetUniformLocation(program, "uLayerPremult");
GLint gl_tex_matrix_loc = glGetUniformLocation(program, "uTexMatrix");
glUniform4f(gl_viewport_loc, cmd.bounds[0] / (float)frame_width,
cmd.bounds[1] / (float)frame_height,
(cmd.bounds[3] - cmd.bounds[1]) / (float)frame_height);
for (unsigned src_index = 0; src_index < cmd.texture_count; src_index++) {
+ std::ostringstream texture_name_formatter;
+ texture_name_formatter << "uLayerTexture" << src_index;
+ GLint gl_tex_loc =
+ glGetUniformLocation(program, texture_name_formatter.str().c_str());
+
const RenderingCommand::TextureSource &src = cmd.textures[src_index];
glUniform1f(gl_alpha_loc + src_index, src.alpha);
+ glUniform1f(gl_premult_loc + src_index, src.premult);
glUniform4f(gl_crop_loc + src_index, src.crop_bounds[0],
src.crop_bounds[1], src.crop_bounds[2] - src.crop_bounds[0],
src.crop_bounds[3] - src.crop_bounds[1]);
- glUniform1i(gl_tex_loc + src_index, src_index);
+ glUniform1i(gl_tex_loc, src_index);
glUniformMatrix2fv(gl_tex_matrix_loc + src_index, 1, GL_FALSE,
src.texture_matrix);
glActiveTexture(GL_TEXTURE0 + src_index);
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