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>
116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
#include "app_base.h"
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#include "imgui.h"
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#include "gfx/shader_canvas.h"
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#include "gfx/gl_shader.h"
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#include "core/fps_overlay.h"
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#include "seed_shaders.h"
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#include <chrono>
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#include <string>
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static fn::gfx::ShaderCanvas g_canvas;
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static std::string g_source = PLASMA;
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static std::string g_last_err;
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static int g_last_err_line = -1;
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static std::chrono::steady_clock::time_point g_last_edit;
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static bool g_dirty = true;
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static void try_compile() {
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auto r = fn::gfx::compile_fragment(g_source);
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if (r.ok) {
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fn::gfx::canvas_set_program(g_canvas, r.program);
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g_last_err.clear();
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g_last_err_line = -1;
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} else {
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g_last_err = r.err_msg;
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g_last_err_line = r.err_line;
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}
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}
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static void mark_dirty() {
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g_last_edit = std::chrono::steady_clock::now();
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g_dirty = true;
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}
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static void load_preset(const char* src) {
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g_source = src;
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mark_dirty();
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}
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static void render() {
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if (!g_canvas.initialized) fn::gfx::canvas_init(g_canvas);
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if (g_dirty) {
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auto now = std::chrono::steady_clock::now();
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auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(now - g_last_edit).count();
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if (elapsed > 250) {
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try_compile();
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g_dirty = false;
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}
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}
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ImGui::DockSpaceOverViewport(0, ImGui::GetMainViewport());
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// --- Code panel ---
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if (ImGui::Begin("Code")) {
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if (ImGui::Button("Plasma")) { load_preset(PLASMA); }
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ImGui::SameLine();
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if (ImGui::Button("Circle")) { load_preset(CIRCLE); }
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ImGui::SameLine();
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if (ImGui::Button("Checker")) { load_preset(CHECKER); }
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ImVec2 avail = ImGui::GetContentRegionAvail();
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float footer_height = g_last_err.empty() ? 0.0f : ImGui::GetTextLineHeightWithSpacing() + 8.0f;
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ImVec2 editor_size(avail.x, avail.y - footer_height);
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char buf[1 << 16];
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size_t copy_len = g_source.size() < sizeof(buf) - 1 ? g_source.size() : sizeof(buf) - 1;
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memcpy(buf, g_source.c_str(), copy_len);
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buf[copy_len] = '\0';
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ImGui::PushFont(nullptr); // use default monospace-ish font
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if (ImGui::InputTextMultiline("##code", buf, sizeof(buf), editor_size,
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ImGuiInputTextFlags_AllowTabInput)) {
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g_source = buf;
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mark_dirty();
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}
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ImGui::PopFont();
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if (!g_last_err.empty()) {
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ImGui::Separator();
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if (g_last_err_line > 0) {
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ImGui::TextColored(ImVec4(1, 0.4f, 0.4f, 1), "line %d: %s",
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g_last_err_line, g_last_err.c_str());
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} else {
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ImGui::TextColored(ImVec4(1, 0.4f, 0.4f, 1), "%s", g_last_err.c_str());
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}
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}
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}
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ImGui::End();
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// --- Canvas panel ---
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if (ImGui::Begin("Canvas")) {
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fn::gfx::canvas_render(g_canvas, static_cast<float>(ImGui::GetTime()));
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}
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ImGui::End();
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// --- Controls panel ---
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if (ImGui::Begin("Controls")) {
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ImGui::TextDisabled("Controls (fase 2)");
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ImGui::Spacing();
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fps_overlay();
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}
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ImGui::End();
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}
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int main() {
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fn::AppConfig cfg;
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cfg.title = "shaders_lab";
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cfg.width = 1400;
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cfg.height = 860;
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int rc = fn::run_app(cfg, render);
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fn::gfx::canvas_destroy(g_canvas);
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return rc;
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}
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