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GL/Texture: Add a GetTextureSubImage fallback/helper

This commit is contained in:
Connor McLaughlin 2020-03-16 00:03:25 +10:00
parent 212fddd195
commit b4153266a0
2 changed files with 37 additions and 1 deletions
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32
src/common/gl/texture.cpp
View File

@ -131,4 +131,36 @@ Texture& Texture::operator=(Texture&& moved)
return *this;
}
void Texture::GetTextureSubImage(GLuint texture, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
GLsizei bufSize, void* pixels)
{
if (GL_VERSION_4_5 || GLAD_GL_ARB_get_texture_sub_image)
{
glGetTextureSubImage(texture, level, xoffset, yoffset, zoffset, width, height, depth, format, type, bufSize,
pixels);
return;
}
Assert(depth == 1);
GLuint old_read_fbo;
glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, reinterpret_cast<GLint*>(&old_read_fbo));
GLuint temp_fbo;
glGenFramebuffers(1, &temp_fbo);
glBindFramebuffer(GL_FRAMEBUFFER, temp_fbo);
if (zoffset > 0 && (GLAD_GL_VERSION_3_0 || GLAD_GL_ES_VERSION_3_0))
glFramebufferTextureLayer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, texture, level, zoffset);
else
glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, level);
GLuint status = glCheckFramebufferStatus(GL_READ_FRAMEBUFFER);
DebugAssert(glCheckFramebufferStatus(GL_READ_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
glReadPixels(xoffset, yoffset, width, height, format, type, pixels);
glBindFramebuffer(GL_READ_FRAMEBUFFER, old_read_fbo);
glDeleteFramebuffers(1, &temp_fbo);
}
} // namespace GL

6
src/common/gl/texture.h
View File

@ -33,8 +33,12 @@ public:
Texture& operator=(const Texture& copy) = delete;
Texture& operator=(Texture&& moved);
private:
// Helper which uses glGetTextureSubImage where available, otherwise a temporary FBO.
static void GetTextureSubImage(GLuint texture, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
GLsizei bufSize, void* pixels);
private:
GLuint m_id = 0;
u32 m_width = 0;
u32 m_height = 0;