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OPENGL: Introduce ShaderManager to handle builtin shaders.

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This commit is contained in:
Johannes Schickel 2016-01-04 07:07:37 +01:00
parent f5f1b6eba0
commit 5498982a37
6 changed files with 106 additions and 54 deletions
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53
backends/graphics/opengl/shader.cpp
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@ -27,8 +27,14 @@
#include "common/textconsole.h"
#include "common/util.h"
namespace Common {
DECLARE_SINGLETON(OpenGL::ShaderManager);
}
namespace OpenGL {
namespace {
const char *const g_defaultVertexShader =
"attribute vec4 position;\n"
"attribute vec2 texCoordIn;\n"
@ -55,7 +61,20 @@ const char *const g_defaultFragmentShader =
"\tgl_FragColor = blendColor * texture2D(texture, texCoord);\n"
"}\n";
namespace {
const char *const g_lookUpFragmentShader =
"varying vec2 texCoord;\n"
"varying vec4 blendColor;\n"
"\n"
"uniform sampler2D texture;\n"
"uniform sampler2D palette;\n"
"\n"
"const float adjustFactor = 255.0 / 256.0 + 1.0 / (2.0 * 256.0);"
"\n"
"void main(void) {\n"
"\tvec4 index = texture2D(texture, texCoord);\n"
"\tgl_FragColor = blendColor * texture2D(palette, vec2(index.a * adjustFactor, 0.0));\n"
"}\n";
// Taken from: https://en.wikibooks.org/wiki/OpenGL_Programming/Modern_OpenGL_Tutorial_03#OpenGL_ES_2_portability
const char *const g_precisionDefines =
@ -219,6 +238,38 @@ GLshader Shader::compileShader(const char *source, GLenum shaderType) {
return handle;
}
ShaderManager::ShaderManager() {
_builtIn[kDefault] = new Shader(g_defaultVertexShader, g_defaultFragmentShader);
_builtIn[kCLUT8LookUp] = new Shader(g_defaultVertexShader, g_lookUpFragmentShader);
}
ShaderManager::~ShaderManager() {
for (int i = 0; i < ARRAYSIZE(_builtIn); ++i) {
delete _builtIn[i];
}
}
void ShaderManager::notifyDestroy() {
for (int i = 0; i < ARRAYSIZE(_builtIn); ++i) {
_builtIn[i]->destroy();
}
}
void ShaderManager::notifyCreate() {
for (int i = 0; i < ARRAYSIZE(_builtIn); ++i) {
_builtIn[i]->recreate();
}
}
Shader *ShaderManager::query(ShaderUsage shader) const {
if (shader == kMaxUsages) {
warning("OpenGL: ShaderManager::query used with kMaxUsages");
return nullptr;
}
return _builtIn[shader];
}
} // End of namespace OpenGL
#endif // !USE_FORCED_GLES