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OpenGL: Allow mGLES2Context to draw to a framebuffer

This commit is contained in:
Vicki Pfau 2022-01-13 15:41:17 -08:00
parent a9ef7af3b1
commit e9ff76c97b
2 changed files with 23 additions and 4 deletions
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26
src/platform/opengl/gles2.c
View File

@ -235,13 +235,15 @@ static void mGLES2ContextResized(struct VideoBackend* v, unsigned w, unsigned h)
context->shaders[n].dirty = true; context->shaders[n].dirty = true;
} }
} }
glBindFramebuffer(GL_FRAMEBUFFER, 0); glBindTexture(GL_TEXTURE_2D, context->finalShader.tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, drawW, drawH, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
glBindFramebuffer(GL_FRAMEBUFFER, context->finalShader.fbo);
glViewport((w - drawW) / 2, (h - drawH) / 2, drawW, drawH); glViewport((w - drawW) / 2, (h - drawH) / 2, drawW, drawH);
} }
static void mGLES2ContextClear(struct VideoBackend* v) { static void mGLES2ContextClear(struct VideoBackend* v) {
UNUSED(v); struct mGLES2Context* context = (struct mGLES2Context*) v;
glBindFramebuffer(GL_FRAMEBUFFER, 0); glBindFramebuffer(GL_FRAMEBUFFER, context->finalShader.fbo);
glClearColor(0.f, 0.f, 0.f, 1.f); glClearColor(0.f, 0.f, 0.f, 1.f);
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
} }
@ -277,7 +279,7 @@ void _drawShader(struct mGLES2Context* context, struct mGLES2Shader* shader) {
GLint oldTex; GLint oldTex;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &oldTex); glGetIntegerv(GL_TEXTURE_BINDING_2D, &oldTex);
glBindTexture(GL_TEXTURE_2D, shader->tex); glBindTexture(GL_TEXTURE_2D, shader->tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, drawW, drawH, 0, GL_RGB, GL_UNSIGNED_BYTE, 0); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, drawW + padW * 2, drawH + padH * 2, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
glBindTexture(GL_TEXTURE_2D, oldTex); glBindTexture(GL_TEXTURE_2D, oldTex);
} }
shader->dirty = false; shader->dirty = false;
@ -434,6 +436,22 @@ void mGLES2ContextCreate(struct mGLES2Context* context) {
context->nShaders = 0; context->nShaders = 0;
} }
void mGLES2ContextUseFramebuffer(struct mGLES2Context* context) {
glGenFramebuffers(1, &context->finalShader.fbo);
glGenTextures(1, &context->finalShader.tex);
glBindTexture(GL_TEXTURE_2D, context->finalShader.tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D, 0);
glBindFramebuffer(GL_FRAMEBUFFER, context->finalShader.fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, context->finalShader.tex, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void mGLES2ShaderInit(struct mGLES2Shader* shader, const char* vs, const char* fs, int width, int height, bool integerScaling, struct mGLES2Uniform* uniforms, size_t nUniforms) { void mGLES2ShaderInit(struct mGLES2Shader* shader, const char* vs, const char* fs, int width, int height, bool integerScaling, struct mGLES2Uniform* uniforms, size_t nUniforms) {
shader->width = width; shader->width = width;
shader->height = height; shader->height = height;

1
src/platform/opengl/gles2.h
View File

@ -92,6 +92,7 @@ struct mGLES2Context {
}; };
void mGLES2ContextCreate(struct mGLES2Context*); void mGLES2ContextCreate(struct mGLES2Context*);
void mGLES2ContextUseFramebuffer(struct mGLES2Context*);
void mGLES2ShaderInit(struct mGLES2Shader*, const char* vs, const char* fs, int width, int height, bool integerScaling, struct mGLES2Uniform* uniforms, size_t nUniforms); void mGLES2ShaderInit(struct mGLES2Shader*, const char* vs, const char* fs, int width, int height, bool integerScaling, struct mGLES2Uniform* uniforms, size_t nUniforms);
void mGLES2ShaderDeinit(struct mGLES2Shader*); void mGLES2ShaderDeinit(struct mGLES2Shader*);