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175 lines
4.8 KiB
C

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#define SOKOL_IMPL
#if defined(WIN32) || defined(_WIN32)
#define SOKOL_D3D11
#endif
#include "sokol_app.h"
#include "sokol_gfx.h"
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#include "sokol_time.h"
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#include "sokol_glue.h"
#include "quad-sapp.glsl.h"
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#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#include "HandMadeMath.h"
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#include <math.h>
// so can be grep'd and removed
#define dbgprint(...) { printf("Debug | %s:%d | ", __FILE__, __LINE__); printf(__VA_ARGS__); }
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static struct {
sg_pass_action pass_action;
sg_pipeline pip;
sg_bindings bind;
} state;
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void init(void) {
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stm_setup();
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sg_setup(&(sg_desc){
.context = sapp_sgcontext()
});
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// load the image
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state.bind.fs_images[SLOT_quad_tex] = sg_alloc_image();
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int png_width, png_height, num_channels;
const int desired_channels = 4;
stbi_uc* pixels = stbi_load(
"assets/merchant.png",
&png_width, &png_height,
&num_channels, 0);
if (pixels) {
sg_init_image(state.bind.fs_images[0], &(sg_image_desc){
.width = png_width,
.height = png_height,
.pixel_format = SG_PIXELFORMAT_RGBA8,
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.min_filter = SG_FILTER_NEAREST,
.mag_filter = SG_FILTER_NEAREST,
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.data.subimage[0][0] = {
.ptr = pixels,
.size = (size_t)(png_width * png_height * 4),
}
});
stbi_image_free(pixels);
}
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state.bind.vertex_buffers[0] = sg_make_buffer(&(sg_buffer_desc){
.usage = SG_USAGE_STREAM,
//.data = SG_RANGE(vertices),
.size = 1024,
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.label = "quad-vertices"
});
/* an index buffer with 2 triangles */
uint16_t indices[] = { 0, 1, 2, 0, 2, 3 };
state.bind.index_buffer = sg_make_buffer(&(sg_buffer_desc){
.type = SG_BUFFERTYPE_INDEXBUFFER,
.data = SG_RANGE(indices),
.label = "quad-indices"
});
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/* a shader (use separate shader sources here */
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sg_shader shd = sg_make_shader(quad_program_shader_desc(sg_query_backend()));
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/* a pipeline state object */
state.pip = sg_make_pipeline(&(sg_pipeline_desc){
.shader = shd,
.index_type = SG_INDEXTYPE_UINT16,
.layout = {
.attrs = {
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[ATTR_quad_vs_position].format = SG_VERTEXFORMAT_FLOAT2,
[ATTR_quad_vs_texcoord0].format = SG_VERTEXFORMAT_FLOAT2,
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}
},
.label = "quad-pipeline"
});
/* default pass action */
state.pass_action = (sg_pass_action) {
.colors[0] = { .action=SG_ACTION_CLEAR, .value={0.0f, 0.0f, 0.0f, 1.0f } }
};
}
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double time = 0.0;
uint64_t last_frame_time;
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void frame(void) {
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// time
{
double dt = stm_sec(stm_diff(stm_now(), last_frame_time));
time += dt;
last_frame_time = stm_now();
}
float new_vertices[] = {
// positions texcoords
-0.5f, 0.5f, 0.0f, 0.0f,
0.5f, 0.5f, 1.0f, 0.0f,
0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, -0.5f, 0.0f, 1.0f,
};
int offset = sg_append_buffer(state.bind.vertex_buffers[0], &SG_RANGE(new_vertices));
state.bind.vertex_buffer_offsets[0] = offset;
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sg_begin_default_pass(&state.pass_action, sapp_width(), sapp_height());
sg_apply_pipeline(state.pip);
sg_apply_bindings(&state.bind);
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int index = (int)floor(time/0.3);
sg_image img = state.bind.fs_images[0];
sg_image_info info = sg_query_image_info(img);
quad_fs_params_t params = {
.tint = {1.0, 1.0, 1.0, 1.0},
.upper_left = {0.0, 0.0},
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.lower_right = {1.0, 1.0},
};
int cell_size = 110;
assert(info.width % cell_size == 0);
int upper_left = (index % (info.width/cell_size)) * cell_size;
params.upper_left[0] = (float)upper_left;
params.lower_right[0] = params.upper_left[0] + (float)cell_size;
params.lower_right[1] = (float)cell_size;
// transform from pixels to uv space
params.upper_left[0] /= (float)info.width;
params.lower_right[0] /= (float)info.width;
params.upper_left[1] /= (float)info.height;
params.lower_right[1] /= (float)info.height;
sg_apply_uniforms(SG_SHADERSTAGE_FS, SLOT_quad_fs_params, &SG_RANGE(params));
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sg_draw(0, 6, 1);
sg_end_pass();
sg_commit();
}
void cleanup(void) {
sg_shutdown();
}
void event(const sapp_event *e) {
if(e->type == SAPP_EVENTTYPE_KEY_DOWN) {
if(e->key_code == SAPP_KEYCODE_ESCAPE) {
sapp_quit();
}
}
}
sapp_desc sokol_main(int argc, char* argv[]) {
(void)argc; (void)argv;
return (sapp_desc){
.init_cb = init,
.frame_cb = frame,
.cleanup_cb = cleanup,
.event_cb = event,
.width = 800,
.height = 600,
.gl_force_gles2 = true,
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.window_title = "RPGPT",
.win32_console_attach = true,
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.icon.sokol_default = true,
};
}