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Make OpenGL 1.5/1.2+VBO backend almost work with 1.1 too, just slower

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This commit is contained in:
UnknownShadow200 2021-07-20 08:59:26 +10:00
parent b9168ee255
commit 2dab8f427e
1 changed files with 51 additions and 12 deletions
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63
src/Graphics_GL.c
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@ -1103,13 +1103,54 @@ void Gfx_DrawVb_IndexedTris(int verticesCount) {
glDrawElements(GL_TRIANGLES, ICOUNT(verticesCount), GL_UNSIGNED_SHORT, IB_PTR);
}
#ifndef CC_BUILD_GL11
#ifdef CC_BUILD_GL11
void Gfx_DrawIndexedTris_T2fC4b(int list, int ignored) { glCallList(list); }
static void GL_CheckSupport(void) { MakeIndices(gl_indices, GFX_MAX_INDICES); }
#else
void Gfx_DrawIndexedTris_T2fC4b(int verticesCount, int startVertex) {
cc_uint32 offset = startVertex * SIZEOF_VERTEX_TEXTURED;
glVertexPointer(3, GL_FLOAT, SIZEOF_VERTEX_TEXTURED, (void*)(offset));
glColorPointer(4, GL_UNSIGNED_BYTE, SIZEOF_VERTEX_TEXTURED, (void*)(offset + 12));
glTexCoordPointer(2, GL_FLOAT, SIZEOF_VERTEX_TEXTURED, (void*)(offset + 16));
glDrawElements(GL_TRIANGLES, ICOUNT(verticesCount), GL_UNSIGNED_SHORT, NULL);
glVertexPointer(3, GL_FLOAT, SIZEOF_VERTEX_TEXTURED, (void*)(VB_PTR + offset));
glColorPointer(4, GL_UNSIGNED_BYTE, SIZEOF_VERTEX_TEXTURED, (void*)(VB_PTR + offset + 12));
glTexCoordPointer(2, GL_FLOAT, SIZEOF_VERTEX_TEXTURED, (void*)(VB_PTR + offset + 16));
glDrawElements(GL_TRIANGLES, ICOUNT(verticesCount), GL_UNSIGNED_SHORT, IB_PTR);
}
/*########################################################################################################################*
*-------------------------------------------------------Compatibility-----------------------------------------------------*
*#########################################################################################################################*/
/* fake vertex buffer objects with client side pointers */
typedef struct fake_buffer { cc_uint8* data; } fake_buffer;
static fake_buffer* cur_ib;
static fake_buffer* cur_vb;
#define fake_GetBuffer(target) (target == _GL_ELEMENT_ARRAY_BUFFER ? &cur_ib : &cur_vb);
static void APIENTRY fake_glBindBuffer(GLenum target, GLuint src) {
fake_buffer** buffer = fake_GetBuffer(target);
*buffer = (fake_buffer*)src;
}
static void APIENTRY fake_glDeleteBuffers(GLsizei n, const GLuint *buffers) {
Mem_Free((void*)buffers[0]);
}
static void APIENTRY fake_glGenBuffers(GLsizei n, GLuint *buffers) {
fake_buffer* buffer = (fake_buffer*)Mem_TryAlloc(1, sizeof(fake_buffer));
buffer->data = NULL;
buffers[0] = (GLuint)buffer;
}
static void APIENTRY fake_glBufferData(GLenum target, cc_uintptr size, const GLvoid* data, GLenum usage) {
fake_buffer* buffer = *fake_GetBuffer(target);
Mem_Free(buffer->data);
buffer->data = Mem_TryAlloc(size, 1);
if (data) Mem_Copy(buffer->data, data, size);
}
static void APIENTRY fake_glBufferSubData(GLenum target, cc_uintptr offset, cc_uintptr size, const GLvoid* data) {
fake_buffer* buffer = *fake_GetBuffer(target);
Mem_Copy(buffer->data, data, size);
}
static void GL_CheckSupport(void) {
@ -1138,15 +1179,13 @@ static void GL_CheckSupport(void) {
} else {
Logger_Abort("Only OpenGL 1.1 supported.\n\n" \
"Compile the game with CC_BUILD_GL11, or ask on the ClassiCube forums for it");
_glBindBuffer = fake_glBindBuffer; _glDeleteBuffers = fake_glDeleteBuffers;
_glGenBuffers = fake_glGenBuffers; _glBufferData = fake_glBufferData;
_glBufferSubData = fake_glBufferSubData;
}
customMipmapsLevels = true;
}
#else
void Gfx_DrawIndexedTris_T2fC4b(int list, int ignored) { glCallList(list); }
static void GL_CheckSupport(void) {
MakeIndices(gl_indices, GFX_MAX_INDICES);
}
#endif /* CC_BUILD_GL11 */
#endif /* !CC_BUILD_GL11 */
#endif /* !CC_BUILD_GLMODERN */
#endif