107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
#include <assert.h>
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#include <stdlib.h>
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#include "glad/gl.h"
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#include "file.h"
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#include "opengl.h"
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#include "flame.h"
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#include "view.h"
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extern unsigned int quad_index_buffer;
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extern unsigned int empty_vertex_array_object;
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namespace flame {
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static unsigned int program;
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static unsigned int flame_texture;
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static unsigned int vertex_array_object;
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const int per_instance_size = 4 * (sizeof (float));
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struct layout {
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struct {
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unsigned int flame_sampler;
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unsigned int frame;
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unsigned int transform;
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unsigned int eye;
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} uniform;
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struct {
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unsigned int lights;
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} binding;
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};
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layout layout = {
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.uniform = {
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.flame_sampler = 0,
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.frame = 1,
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.transform = 2,
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.eye = 3,
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},
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.binding = {
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.lights = 0,
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},
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};
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void load_program()
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{
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program = compile_from_files("shader/flame.vert",
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nullptr,
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"shader/flame.frag");
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}
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void load_texture()
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{
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unsigned int texture;
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glGenTextures(1, &texture);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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int texture_data_size;
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void const * texture_data = file::read_file("minecraft/flame.data", &texture_data_size);
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assert(texture_data != nullptr);
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int width = 16;
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int height = 80;
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture_data);
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file::free(texture_data);
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glBindTexture(GL_TEXTURE_2D, 0);
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flame_texture = texture;
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}
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static int frame = 0;
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void draw(unsigned int light_uniform_buffer, int light_count)
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{
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glUseProgram(program);
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glBlendFunc(GL_ONE, GL_ZERO);
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(GL_GREATER);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, flame_texture);
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glUniform1i(layout.uniform.frame, (frame / 20) % 4);
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frame++;
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glUniformMatrix4fv(layout.uniform.transform, 1, false, (float *)&view::state.float_transform);
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XMFLOAT3 eye;
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XMStoreFloat3(&eye, view::state.eye);
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glUniform3fv(layout.uniform.eye, 1, (float *)&eye);
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glBindBufferBase(GL_UNIFORM_BUFFER, layout.binding.lights, light_uniform_buffer);
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glBindVertexArray(empty_vertex_array_object);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, quad_index_buffer);
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glDrawElementsInstanced(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_BYTE, (void *)0, light_count);
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}
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}
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