100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
#include "./particle.h"
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#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <GL/glew.h>
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#include "util/gleasy/program.h"
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#include "util/math/vector.h"
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#include "./instanced.h"
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#include "./uniblock.h"
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/* resources */
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#include "core/loshader/anysrc/header.shader.h"
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#include "core/loshader/anysrc/particle.vshader.h"
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#include "core/loshader/anysrc/particle.fshader.h"
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#define VSHADER_IN_PARTICLE_ID_ 0
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#define VSHADER_IN_POS_ 1
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#define VSHADER_IN_SIZE_ 2
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#define VSHADER_IN_COLOR_ 3
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#define VSHADER_IN_TIME_ 4
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#define PRIMITIVE_COUNT_ 6
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#pragma pack(push, 1)
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typedef struct {
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uint16_t particle_id;
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vec2_t pos;
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vec2_t size;
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vec4_t color;
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float time;
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} loshader_particle_drawer_internal_instance_t;
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#pragma pack(pop)
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void loshader_particle_drawer_initialize(
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loshader_particle_drawer_t* drawer,
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const loshader_uniblock_t* uniblock) {
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assert(drawer != NULL);
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assert(uniblock != NULL);
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const gleasy_program_t prog = gleasy_program_new(
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loshader_header_shader_, sizeof(loshader_header_shader_),
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loshader_particle_vshader_, sizeof(loshader_particle_vshader_),
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loshader_particle_fshader_, sizeof(loshader_particle_fshader_));
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loshader_instanced_drawer_initialize(
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&drawer->super,
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prog,
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uniblock,
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sizeof(loshader_particle_drawer_internal_instance_t));
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glBindVertexArray(drawer->super.vao);
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glBindBuffer(GL_ARRAY_BUFFER, drawer->super.instances);
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# define enable_(index, var, dim, type) do { \
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glEnableVertexAttribArray(index); \
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glVertexAttribPointer( \
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index, dim, type, GL_FALSE, \
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sizeof(loshader_particle_drawer_internal_instance_t), \
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NULL + offsetof(loshader_particle_drawer_internal_instance_t, var)); \
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glVertexAttribDivisor(index, 1); \
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} while (0)
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enable_(VSHADER_IN_PARTICLE_ID_, particle_id, 1, GL_UNSIGNED_SHORT);
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enable_(VSHADER_IN_POS_, pos, 2, GL_FLOAT);
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enable_(VSHADER_IN_SIZE_, size, 2, GL_FLOAT);
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enable_(VSHADER_IN_COLOR_, color, 4, GL_FLOAT);
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enable_(VSHADER_IN_TIME_, time, 1, GL_FLOAT);
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# undef enable_
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}
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void loshader_particle_drawer_add_instance(
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loshader_particle_drawer_t* drawer,
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const loshader_particle_drawer_instance_t* instance) {
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assert(drawer != NULL);
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assert(instance != NULL);
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const loshader_particle_drawer_internal_instance_t inst = {
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.particle_id = instance->particle_id,
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.pos = instance->pos,
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.size = instance->size,
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};
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if (!loshader_instanced_drawer_add_instance(&drawer->super, &inst)) {
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fprintf(stderr, "particle drawer instance overflow\n");
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abort();
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}
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}
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void loshader_particle_drawer_draw(const loshader_particle_drawer_t* drawer) {
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assert(drawer != NULL);
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loshader_instanced_drawer_draw(&drawer->super, PRIMITIVE_COUNT_);
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}
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