egutierrez
fd5787c55f
- .mcp.json - bash/functions/infra/write_mcp_jupyter_config.md - bash/functions/infra/write_mcp_jupyter_config.sh - cpp/CMakeLists.txt - cpp/apps/chart_demo - cpp/apps/shaders_lab - cpp/functions/gfx/gl_framebuffer.cpp - cpp/functions/gfx/gl_framebuffer.h - cpp/functions/gfx/gl_framebuffer.md - cpp/functions/gfx/mesh_gpu.md - ... Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
82 lines
2.9 KiB
C++
82 lines
2.9 KiB
C++
#include "gfx/gl_loader.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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static void create_depth_rbo(Framebuffer& f) {
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glGenRenderbuffers(1, &f.depth_rbo);
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glBindRenderbuffer(GL_RENDERBUFFER, f.depth_rbo);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, f.width, f.height);
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glBindRenderbuffer(GL_RENDERBUFFER, 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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f.has_depth = false;
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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_init_depth(Framebuffer& f) {
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f.width = 1;
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f.height = 1;
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f.has_depth = true;
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create_tex(f);
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create_depth_rbo(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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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, f.depth_rbo);
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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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// Recreate color texture.
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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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// Resize depth renderbuffer in-place (no need to recreate).
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if (f.has_depth && f.depth_rbo) {
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glBindRenderbuffer(GL_RENDERBUFFER, f.depth_rbo);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, f.width, f.height);
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glBindRenderbuffer(GL_RENDERBUFFER, 0);
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// Re-attach in case it was lost (should be stable across storage resize, but be safe).
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, f.depth_rbo);
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}
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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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if (f.depth_rbo) { glDeleteRenderbuffers(1, &f.depth_rbo); f.depth_rbo = 0; }
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f.width = 0;
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f.height = 0;
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f.has_depth = false;
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}
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} // namespace fn::gfx
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