egutierrez
3008b56e76
- cpp/functions/gfx: gl_shader, gl_framebuffer, fullscreen_quad, shader_canvas - cpp/apps/shaders_lab: main + 3 seed shaders (plasma, circle, checker) - ImGui docking layout: Code | Canvas | Controls Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
#define GL_GLEXT_PROTOTYPES
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#include <GL/gl.h>
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#include <GL/glext.h>
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#include "gfx/gl_framebuffer.h"
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namespace fn::gfx {
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static void create_tex(Framebuffer& f) {
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glGenTextures(1, &f.tex);
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glBindTexture(GL_TEXTURE_2D, f.tex);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, f.width, f.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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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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glBindTexture(GL_TEXTURE_2D, 0);
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}
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void fb_init(Framebuffer& f) {
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f.width = 1;
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f.height = 1;
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create_tex(f);
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glGenFramebuffers(1, &f.fbo);
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glBindFramebuffer(GL_FRAMEBUFFER, f.fbo);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, f.tex, 0);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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void fb_resize(Framebuffer& f, int w, int h) {
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if (w == f.width && h == f.height) return;
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f.width = w;
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f.height = h;
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if (f.tex) glDeleteTextures(1, &f.tex);
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f.tex = 0;
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create_tex(f);
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glBindFramebuffer(GL_FRAMEBUFFER, f.fbo);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, f.tex, 0);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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void fb_destroy(Framebuffer& f) {
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if (f.fbo) { glDeleteFramebuffers(1, &f.fbo); f.fbo = 0; }
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if (f.tex) { glDeleteTextures(1, &f.tex); f.tex = 0; }
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f.width = 0;
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f.height = 0;
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}
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} // namespace fn::gfx
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