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gsdx ogl: add GL_ARB_get_texture_sub_image extension support 

could help to read back a portion of a texture
This commit is contained in:
Gregory Hainaut 2016-05-16 18:45:47 +02:00
parent e02753df46
commit fa921215d9
4 changed files with 7 additions and 1 deletions
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4
plugins/GSdx/GLLoader.cpp
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@ -151,6 +151,7 @@ PFNGLCREATEPROGRAMPIPELINESPROC glCreateProgramPipelines = NUL
PFNGLCLIPCONTROLPROC glClipControl = NULL;
PFNGLTEXTUREBARRIERPROC glTextureBarrier = NULL;
PFNGLGETTEXTURESUBIMAGEPROC glGetTextureSubImage = NULL;
namespace ReplaceGL {
void APIENTRY BlendEquationSeparateiARB(GLuint buf, GLenum modeRGB, GLenum modeAlpha)
@ -186,6 +187,7 @@ namespace GLLoader {
bool found_geometry_shader = true; // we require GL3.3 so geometry must be supported by default
bool found_GL_EXT_texture_filter_anisotropic = false;
bool found_GL_ARB_clear_texture = false; // Miss AMD Mesa (otherwise seems SW)
bool found_GL_ARB_get_texture_sub_image = false; // Not yet used
// DX11 GPU
bool found_GL_ARB_draw_buffers_blend = false; // Not supported on AMD R600 (80 nm class chip, HD2900). Nvidia requires FERMI. Intel SB
bool found_GL_ARB_gpu_shader5 = false; // Require IvyBridge
@ -300,6 +302,7 @@ namespace GLLoader {
if (ext.compare("GL_ARB_direct_state_access") == 0) found_GL_ARB_direct_state_access = true;
if (ext.compare("GL_ARB_clip_control") == 0) found_GL_ARB_clip_control = true;
if (ext.compare("GL_ARB_texture_barrier") == 0) found_GL_ARB_texture_barrier = true;
if (ext.compare("GL_ARB_get_texture_sub_image") == 0) found_GL_ARB_get_texture_sub_image = true;
//fprintf(stderr, "DEBUG ext: %s\n", ext.c_str());
}
@ -329,6 +332,7 @@ namespace GLLoader {
status &= status_and_override(found_GL_ARB_clip_control, "GL_ARB_clip_control", true);
status &= status_and_override(found_GL_ARB_direct_state_access, "GL_ARB_direct_state_access", true);
status &= status_and_override(found_GL_ARB_texture_barrier, "GL_ARB_texture_barrier", true);
status &= status_and_override(found_GL_ARB_get_texture_sub_image, "GL_ARB_get_texture_sub_image");
#ifdef _WIN32
if (status) {

1
plugins/GSdx/GLLoader.h
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@ -326,6 +326,7 @@ extern PFNGLCREATEPROGRAMPIPELINESPROC glCreateProgramPipelines;
extern PFNGLCLIPCONTROLPROC glClipControl;
extern PFNGLTEXTUREBARRIERPROC glTextureBarrier;
extern PFNGLGETTEXTURESUBIMAGEPROC glGetTextureSubImage;
namespace GLLoader {
bool check_gl_version(int major, int minor);

2
plugins/GSdx/GSTextureOGL.cpp
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@ -365,7 +365,7 @@ bool GSTextureOGL::Map(GSMap& m, const GSVector4i* _r)
// Maybe it is as good as the code below. I don't know
// With openGL 4.5 you can use glGetTextureSubImage
glGetTextureSubImage(m_texture_id, GL_TEX_LEVEL_0, r.x, r.y, 0, r.width(), r.height(), 0, m_int_format, m_int_type, m_size.x * m_size.y * 4, m_local_buffer);
glGetTextureSubImage(m_texture_id, GL_TEX_LEVEL_0, r.x, r.y, 0, r.width(), r.height(), 1, m_int_format, m_int_type, m_size.x * m_size.y * 4, m_local_buffer);
#else
// Bind the texture to the read framebuffer to avoid any disturbance

1
plugins/GSdx/GSWnd.cpp
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@ -160,4 +160,5 @@ void GSWndGL::PopulateGlFunction()
GL_EXT_LOAD(glClipControl);
GL_EXT_LOAD(glTextureBarrier);
GL_EXT_LOAD_OPT(glGetTextureSubImage);
}