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Document the OpenGL renderer a bit more

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This makes it easier to find things
This commit is contained in:
Clownacy 2020-02-02 00:21:28 +00:00
parent d84f64a5a9
commit 514d9f8739
1 changed files with 32 additions and 0 deletions
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32
src/Backends/Rendering/OpenGL3.cpp
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@ -254,6 +254,10 @@ static void GLAPIENTRY MessageCallback(GLenum source, GLenum type, GLuint id, GL
printf("OpenGL debug: %s\n", message);
}
*/
// ====================
// Shader compilation
// ====================
static GLuint CompileShader(const char *vertex_shader_source, const char *fragment_shader_source)
{
GLint shader_status;
@ -307,6 +311,10 @@ static GLuint CompileShader(const char *vertex_shader_source, const char *fragme
return program_id;
}
// ====================
// Vertex buffer management
// ====================
static VertexBufferSlot* GetVertexBufferSlot(unsigned int slots_needed)
{
if (current_vertex_buffer_slot + slots_needed > local_vertex_buffer_size)
@ -354,6 +362,10 @@ static void FlushVertexBuffer(void)
current_vertex_buffer_slot = 0;
}
// ====================
// Glyph-batching
// ====================
// Blit the glyphs in the batch
static void GlyphBatch_Draw(spritebatch_sprite_t *sprites, int count, int texture_w, int texture_h, void *udata)
{
@ -492,6 +504,10 @@ static void GlyphBatch_DestroyTexture(SPRITEBATCH_U64 texture_id, void *udata)
glDeleteTextures(1, (GLuint*)&texture_id);
}
// ====================
// Render-backend initialisation
// ====================
Backend_Surface* Backend_Init(const char *title, int width, int height, BOOL fullscreen)
{
#ifdef USE_OPENGLES2
@ -753,6 +769,10 @@ void Backend_DrawScreen(void)
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer_id);
}
// ====================
// Surface management
// ====================
Backend_Surface* Backend_CreateSurface(unsigned int width, unsigned int height)
{
Backend_Surface *surface = (Backend_Surface*)malloc(sizeof(Backend_Surface));
@ -832,6 +852,10 @@ void Backend_UnlockSurface(Backend_Surface *surface, unsigned int width, unsigne
glBindTexture(GL_TEXTURE_2D, previously_bound_texture);
}
// ====================
// Drawing
// ====================
void Backend_Blit(Backend_Surface *source_surface, const RECT *rect, Backend_Surface *destination_surface, long x, long y, BOOL colour_key)
{
static Backend_Surface *last_source_surface;
@ -968,6 +992,10 @@ void Backend_ColourFill(Backend_Surface *surface, const RECT *rect, unsigned cha
vertex_buffer_slot->vertices[1][2].vertex_coordinate.y = vertex_bottom;
}
// ====================
// Glyph management
// ====================
Backend_Glyph* Backend_LoadGlyph(const unsigned char *pixels, unsigned int width, unsigned int height, int pitch)
{
Backend_Glyph *glyph = (Backend_Glyph*)malloc(sizeof(Backend_Glyph));
@ -1027,6 +1055,10 @@ void Backend_FlushGlyphs(void)
spritebatch_flush(&glyph_batcher);
}
// ====================
// Misc.
// ====================
void Backend_HandleRenderTargetLoss(void)
{
// No problem for us