93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
#include "./instanced.h"
|
|
|
|
#include <assert.h>
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
|
|
#include <GL/glew.h>
|
|
|
|
#include "util/gleasy/buffer.h"
|
|
#include "util/gleasy/program.h"
|
|
|
|
#include "./uniblock.h"
|
|
|
|
#define UNIBLOCK_INDEX_ 0
|
|
|
|
void loshader_instanced_drawer_initialize(
|
|
loshader_instanced_drawer_t* drawer,
|
|
gleasy_program_t prog,
|
|
const loshader_uniblock_t* uniblock,
|
|
size_t instance_size) {
|
|
assert(drawer != NULL);
|
|
assert(uniblock != NULL);
|
|
assert(instance_size > 0);
|
|
|
|
const GLuint uniblock_index = glGetUniformBlockIndex(prog, "uniblock");
|
|
assert(glGetError() == GL_NO_ERROR);
|
|
glUniformBlockBinding(prog, uniblock_index, UNIBLOCK_INDEX_);
|
|
|
|
*drawer = (typeof(*drawer)) {
|
|
.prog = prog,
|
|
.uniblock = uniblock,
|
|
.instance_size = instance_size,
|
|
};
|
|
|
|
glCreateVertexArrays(1, &drawer->vao);
|
|
glGenBuffers(1, &drawer->instances);
|
|
}
|
|
|
|
void loshader_instanced_drawer_deinitialize(
|
|
loshader_instanced_drawer_t* drawer) {
|
|
assert(drawer != NULL);
|
|
|
|
glDeleteVertexArrays(1, &drawer->vao);
|
|
glDeleteBuffers(1, &drawer->instances);
|
|
glDeleteProgram(drawer->prog);
|
|
}
|
|
|
|
void loshader_instanced_drawer_clear(
|
|
loshader_instanced_drawer_t* drawer, size_t reserve) {
|
|
assert(drawer != NULL);
|
|
assert(reserve > 0);
|
|
|
|
drawer->instances_length = 0;
|
|
|
|
if (drawer->instances_reserved < reserve) {
|
|
glBindBuffer(GL_ARRAY_BUFFER, drawer->instances);
|
|
glBufferData(GL_ARRAY_BUFFER,
|
|
reserve*drawer->instance_size, NULL, GL_DYNAMIC_DRAW);
|
|
drawer->instances_reserved = reserve;
|
|
}
|
|
}
|
|
|
|
bool loshader_instanced_drawer_add_instance(
|
|
loshader_instanced_drawer_t* drawer, const void* instance) {
|
|
assert(drawer != NULL);
|
|
assert(instance != NULL);
|
|
|
|
if (drawer->instances_length >= drawer->instances_reserved) {
|
|
return false;
|
|
}
|
|
|
|
const size_t offset = drawer->instances_length*drawer->instance_size;
|
|
glBindBuffer(GL_ARRAY_BUFFER, drawer->instances);
|
|
glBufferSubData(GL_ARRAY_BUFFER, offset, drawer->instance_size, instance);
|
|
|
|
++drawer->instances_length;
|
|
return true;
|
|
}
|
|
|
|
void loshader_instanced_drawer_draw(
|
|
const loshader_instanced_drawer_t* drawer, size_t primitives) {
|
|
assert(drawer != NULL);
|
|
|
|
if (primitives == 0 || drawer->instances_length == 0) return;
|
|
|
|
glUseProgram(drawer->prog);
|
|
glBindVertexArray(drawer->vao);
|
|
|
|
loshader_uniblock_bind(drawer->uniblock, UNIBLOCK_INDEX_);
|
|
|
|
glDrawArraysInstanced(GL_TRIANGLES, 0, primitives, drawer->instances_length);
|
|
}
|