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Orphan vertex buffers for improved performance

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Bump my Raspberry Pi 3B+ from 100FPS to 120FPS.
This commit is contained in:
Clownacy 2020-09-19 21:50:20 +01:00
parent 9a990d6fa7
commit a8bcf5a6fb
1 changed files with 9 additions and 28 deletions
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37
src/Backends/Rendering/OpenGL3.cpp
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@ -18,8 +18,6 @@
#define MIN(a,b) ((a) < (b) ? (a) : (b)) #define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) > (b) ? (a) : (b)) #define MAX(a,b) ((a) > (b) ? (a) : (b))
#define TOTAL_VBOS 8
#define ATTRIBUTE_INPUT_VERTEX_COORDINATES 1 #define ATTRIBUTE_INPUT_VERTEX_COORDINATES 1
#define ATTRIBUTE_INPUT_TEXTURE_COORDINATES 2 #define ATTRIBUTE_INPUT_TEXTURE_COORDINATES 2
@ -108,7 +106,7 @@ static struct
#ifndef USE_OPENGLES2 #ifndef USE_OPENGLES2
static GLuint vertex_array_id; static GLuint vertex_array_id;
#endif #endif
static GLuint vertex_buffer_ids[TOTAL_VBOS]; static GLuint vertex_buffer_id;
static GLuint framebuffer_id; static GLuint framebuffer_id;
static VertexBufferSlot *local_vertex_buffer; static VertexBufferSlot *local_vertex_buffer;
@ -395,30 +393,10 @@ static VertexBufferSlot* GetVertexBufferSlot(void)
static void FlushVertexBuffer(void) static void FlushVertexBuffer(void)
{ {
static size_t vertex_buffer_size[TOTAL_VBOS];
static size_t current_vertex_buffer = 0;
if (current_vertex_buffer_slot == 0) if (current_vertex_buffer_slot == 0)
return; return;
// Select new VBO glBufferData(GL_ARRAY_BUFFER, current_vertex_buffer_slot * sizeof(VertexBufferSlot), local_vertex_buffer, GL_STREAM_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer_ids[current_vertex_buffer]);
glVertexAttribPointer(ATTRIBUTE_INPUT_VERTEX_COORDINATES, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, position));
glVertexAttribPointer(ATTRIBUTE_INPUT_TEXTURE_COORDINATES, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, texture));
// Upload vertex buffer to VBO, growing it if necessary
if (local_vertex_buffer_size > vertex_buffer_size[current_vertex_buffer])
{
vertex_buffer_size[current_vertex_buffer] = local_vertex_buffer_size;
glBufferData(GL_ARRAY_BUFFER, vertex_buffer_size[current_vertex_buffer] * sizeof(VertexBufferSlot), local_vertex_buffer, GL_DYNAMIC_DRAW);
}
else
{
glBufferSubData(GL_ARRAY_BUFFER, 0, current_vertex_buffer_slot * sizeof(VertexBufferSlot), local_vertex_buffer);
}
if (++current_vertex_buffer >= TOTAL_VBOS)
current_vertex_buffer = 0;
glDrawArrays(GL_TRIANGLES, 0, 6 * current_vertex_buffer_slot); glDrawArrays(GL_TRIANGLES, 0, 6 * current_vertex_buffer_slot);
@ -514,8 +492,11 @@ RenderBackend_Surface* RenderBackend_Init(const char *window_title, size_t scree
glBindVertexArray(vertex_array_id); glBindVertexArray(vertex_array_id);
#endif #endif
// Set up Vertex Buffer Objects // Set up Vertex Buffer Object
glGenBuffers(TOTAL_VBOS, vertex_buffer_ids); glGenBuffers(1, &vertex_buffer_id);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer_id);
glVertexAttribPointer(ATTRIBUTE_INPUT_VERTEX_COORDINATES, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, position));
glVertexAttribPointer(ATTRIBUTE_INPUT_TEXTURE_COORDINATES, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*)offsetof(Vertex, texture));
// Set up the vertex attributes // Set up the vertex attributes
glEnableVertexAttribArray(ATTRIBUTE_INPUT_VERTEX_COORDINATES); glEnableVertexAttribArray(ATTRIBUTE_INPUT_VERTEX_COORDINATES);
@ -569,7 +550,7 @@ RenderBackend_Surface* RenderBackend_Init(const char *window_title, size_t scree
if (program_texture.id != 0) if (program_texture.id != 0)
glDeleteProgram(program_texture.id); glDeleteProgram(program_texture.id);
glDeleteBuffers(TOTAL_VBOS, vertex_buffer_ids); glDeleteBuffers(1, &vertex_buffer_id);
#ifndef USE_OPENGLES2 #ifndef USE_OPENGLES2
glDeleteVertexArrays(1, &vertex_array_id); glDeleteVertexArrays(1, &vertex_array_id);
#endif #endif
@ -590,7 +571,7 @@ void RenderBackend_Deinit(void)
glDeleteProgram(program_colour_fill.id); glDeleteProgram(program_colour_fill.id);
glDeleteProgram(program_texture_colour_key.id); glDeleteProgram(program_texture_colour_key.id);
glDeleteProgram(program_texture.id); glDeleteProgram(program_texture.id);
glDeleteBuffers(TOTAL_VBOS, vertex_buffer_ids); glDeleteBuffers(1, &vertex_buffer_id);
#ifndef USE_OPENGLES2 #ifndef USE_OPENGLES2
glDeleteVertexArrays(1, &vertex_array_id); glDeleteVertexArrays(1, &vertex_array_id);
#endif #endif