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ProgramShaderCache: Create a FBO for shared contexts to draw into 

This way it allows us to use surfaceless contexts in EGL/GLX. It also
ensures that the shared context shares a similar setup to the main
context's framebuffer, potentially reducing the number of variants a
driver needs to generate.
This commit is contained in:
Stenzek 2017-07-31 22:39:52 +10:00
parent d0bcdc7f89
commit 67997529b8
2 changed files with 37 additions and 0 deletions
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34
Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp
View File

@ -1175,6 +1175,24 @@ void ProgramShaderCache::UberShaderCompileWorkItem::Retrieve()
void ProgramShaderCache::CreatePrerenderArrays(SharedContextData* data) void ProgramShaderCache::CreatePrerenderArrays(SharedContextData* data)
{ {
// Create a framebuffer object to render into.
// This is because in EGL, and potentially GLX, we have a surfaceless context.
glGenTextures(1, &data->prerender_FBO_tex);
glBindTexture(GL_TEXTURE_2D_ARRAY, data->prerender_FBO_tex);
glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA, 1, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_LEVEL, 1);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glGenTextures(1, &data->prerender_FBO_depth);
glBindTexture(GL_TEXTURE_2D_ARRAY, data->prerender_FBO_depth);
glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_DEPTH_COMPONENT32F, 1, 1, 1, 0, GL_DEPTH_COMPONENT,
GL_FLOAT, nullptr);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_LEVEL, 1);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glGenFramebuffers(1, &data->prerender_FBO);
glBindFramebuffer(GL_FRAMEBUFFER, data->prerender_FBO);
glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, data->prerender_FBO_tex, 0, 0);
glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, data->prerender_FBO_depth, 0, 0);
// Create VAO for the prerender vertices. // Create VAO for the prerender vertices.
// We don't use the normal VAO map, since we need to change the VBO pointer. // We don't use the normal VAO map, since we need to change the VBO pointer.
glGenVertexArrays(1, &data->prerender_VAO); glGenVertexArrays(1, &data->prerender_VAO);
@ -1257,6 +1275,22 @@ void ProgramShaderCache::DestroyPrerenderArrays(SharedContextData* data)
glDeleteBuffers(1, &data->prerender_IBO); glDeleteBuffers(1, &data->prerender_IBO);
data->prerender_IBO = 0; data->prerender_IBO = 0;
} }
if (data->prerender_FBO)
{
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glDeleteFramebuffers(1, &data->prerender_FBO);
data->prerender_FBO = 0;
}
if (data->prerender_FBO_tex)
{
glDeleteTextures(1, &data->prerender_FBO_tex);
data->prerender_FBO_tex = 0;
}
if (data->prerender_FBO_depth)
{
glDeleteTextures(1, &data->prerender_FBO_depth);
data->prerender_FBO_depth = 0;
}
} }
void ProgramShaderCache::DrawPrerenderArray(const SHADER& shader, u32 primitive_type) void ProgramShaderCache::DrawPrerenderArray(const SHADER& shader, u32 primitive_type)

3
Source/Core/VideoBackends/OGL/ProgramShaderCache.h
View File

@ -154,6 +154,9 @@ private:
struct SharedContextData struct SharedContextData
{ {
std::unique_ptr<cInterfaceBase> context; std::unique_ptr<cInterfaceBase> context;
GLuint prerender_FBO;
GLuint prerender_FBO_tex;
GLuint prerender_FBO_depth;
GLuint prerender_VBO; GLuint prerender_VBO;
GLuint prerender_VAO; GLuint prerender_VAO;
GLuint prerender_IBO; GLuint prerender_IBO;