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