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Merge pull request #1416 from ts-korhonen/opengl

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Alternative buffer method for older GPUs in OpenGL Core
This commit is contained in:
Miran Grča
2021-05-01 18:07:45 +02:00
committed by GitHub
parent 084d8f50de 7b227b3ec1
commit 6b2e544306
1 changed files with 31 additions and 10 deletions
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41
src/win/win_opengl.c
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@@ -361,14 +361,26 @@ static int initialize_glcontext(gl_identifiers* gl)
glGenBuffers(1, &gl->unpackBufferID);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, gl->unpackBufferID);
/* Create persistent buffer for pixel transfer. */
glBufferStorage(GL_PIXEL_UNPACK_BUFFER, BUFFERBYTES * BUFFERCOUNT, NULL, GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | GL_MAP_COHERENT_BIT);
void* buf_ptr = glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, BUFFERBYTES * BUFFERCOUNT, GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | GL_MAP_COHERENT_BIT);
void* buf_ptr = NULL;
if (GLAD_GL_ARB_buffer_storage)
{
/* Create persistent buffer for pixel transfer. */
glBufferStorage(GL_PIXEL_UNPACK_BUFFER, BUFFERBYTES * BUFFERCOUNT, NULL, GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | GL_MAP_COHERENT_BIT);
buf_ptr = glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, BUFFERBYTES * BUFFERCOUNT, GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | GL_MAP_COHERENT_BIT);
}
else
{
/* Fallback; create our own buffer. */
buf_ptr = malloc(BUFFERBYTES * BUFFERCOUNT);
glBufferData(GL_PIXEL_UNPACK_BUFFER, BUFFERBYTES * BUFFERCOUNT, NULL, GL_STREAM_DRAW);
}
if (buf_ptr == NULL)
return 0;
return 0; /* Most likely out of memory. */
/* Split the buffer area for each blit_info and set them available for use. */
for (int i = 0; i < BUFFERCOUNT; i++)
{
@@ -389,8 +401,12 @@ static int initialize_glcontext(gl_identifiers* gl)
*/
static void finalize_glcontext(gl_identifiers* gl)
{
if (GLAD_GL_ARB_buffer_storage)
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
else
free(blit_info[0].buffer);
glDeleteProgram(gl->shader_progID);
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
glDeleteBuffers(1, &gl->unpackBufferID);
glDeleteTextures(1, &gl->textureID);
glDeleteBuffers(1, &gl->vertexBufferID);
@@ -440,7 +456,6 @@ static void __stdcall opengl_debugmsg_callback(GLenum source, GLenum type, GLuin
OutputDebugStringA(message);
OutputDebugStringA("\n");
}
#endif
*/
/**
@@ -491,7 +506,7 @@ static void opengl_main(void* param)
SDL_GL_SetSwapInterval(options.vsync);
if (!gladLoadGLLoader(SDL_GL_GetProcAddress) || !GLAD_GL_ARB_buffer_storage)
if (!gladLoadGLLoader(SDL_GL_GetProcAddress))
{
SDL_GL_DeleteContext(context);
opengl_fail();
@@ -608,6 +623,12 @@ static void opengl_main(void* param)
SetEvent(sync_objects.resize);
}
if (!GLAD_GL_ARB_buffer_storage)
{
/* Fallback method, copy data to pixel buffer. */
glBufferSubData(GL_PIXEL_UNPACK_BUFFER, BUFFERBYTES * read_pos, info->w * (info->y2 - info->y1) * sizeof(uint32_t), info->buffer);
}
/* Update texture from pixel buffer. */
glPixelStorei(GL_UNPACK_SKIP_PIXELS, BUFFERPIXELS * read_pos);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, info->y1, info->w, info->y2 - info->y1, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL);
@@ -765,7 +786,7 @@ static void opengl_blit(int x, int y, int y1, int y2, int w, int h)
return;
}
memcpy(blit_info[write_pos].buffer, &(render_buffer->dat)[y1 * w], w * (y2 - y1) * 4);
memcpy(blit_info[write_pos].buffer, &(render_buffer->dat)[y1 * w], w * (y2 - y1) * sizeof(uint32_t));
video_blit_complete();