72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
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// BEWARE std140 packing:
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// https://learn.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl-packing-rules
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typedef struct My_Cbuffer {
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Vector2 mouse_pos_screen;
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Vector2 window_size;
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} My_Cbuffer;
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int entry(int argc, char **argv) {
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window.title = STR("Custom Shader Example");
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window.scaled_width = 1280;
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window.scaled_height = 720;
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window.x = 200;
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window.y = 90;
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window.clear_color = hex_to_rgba(0x6495EDff);
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string source;
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bool ok = os_read_entire_file("oogabooga/examples/custom_shader.hlsl", &source, get_heap_allocator());
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assert(ok, "Could not read oogabooga/examples/custom_shader.hlsl");
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// This is slow and needs to recompile the shader. However, it should probably only happen once (or each hot reload)
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// If it fails, it will return false and return to whatever shader it was before.
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shader_recompile_with_extension(source, sizeof(My_Cbuffer));
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dealloc_string(get_heap_allocator(), source);
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// This memory needs to stay alive throughout the frame because we pass the pointer to it in draw_frame.cbuffer.
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// If this memory is invalidated before gfx_update after setting draw_frame.cbuffer, then gfx_update will copy
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// memory from an invalid address.
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My_Cbuffer cbuffer;
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float64 last_time = os_get_current_time_in_seconds();
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while (!window.should_close) {
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float64 now = os_get_current_time_in_seconds();
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if ((int)now != (int)last_time) {
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log("%.2f FPS\n%.2fms", 1.0/(now-last_time), (now-last_time)*1000);
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}
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last_time = now;
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reset_temporary_storage();
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cbuffer.mouse_pos_screen = v2(input_frame.mouse_x, input_frame.mouse_y);
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cbuffer.window_size = v2(window.width, window.height);
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draw_frame.cbuffer = &cbuffer;
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// Just draw a big rect to cover background, so our lighting shader will apply to background
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draw_rect(v2(-5, -5), v2(10, 10), v4(.4, .4, .4, 1.0));
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Matrix4 rect_xform = m4_scalar(1.0);
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rect_xform = m4_rotate_z(rect_xform, (f32)now);
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rect_xform = m4_translate(rect_xform, v3(-.25f, -.25f, 0));
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draw_rect_xform(rect_xform, v2(.5f, .5f), COLOR_GREEN);
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draw_rect(v2(sin(now), -.8), v2(.5, .25), COLOR_RED);
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// Shader hot reloading
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if (is_key_just_pressed('R')) {
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ok = os_read_entire_file("oogabooga/examples/custom_shader.hlsl", &source, get_heap_allocator());
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assert(ok, "Could not read oogabooga/examples/custom_shader.hlsl");
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shader_recompile_with_extension(source, sizeof(My_Cbuffer));
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dealloc_string(get_heap_allocator(), source);
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}
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os_update();
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gfx_update();
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}
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return 0;
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}
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