adding gfx and ui stuff
This commit is contained in:
Daniel Ledda
275
gfx/render.c
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275
gfx/render.c
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#include "render.h"
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static RenderObjects_Char createCharObjects(Arena *arena, size_t count) {
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RenderObjects_Char result = {0};
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result.count = count;
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result.begin.buf = PushFullList(arena, Vec2List, count);
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result.glyph.buf = PushFullList(arena, IntList, count);
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result.fontSize.buf = PushFullList(arena, FloatList, count);
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result.color.buf = PushFullList(arena, Vec4List, count);
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glGenVertexArrays(1, &result.vao);
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glGenBuffers(1, &result.begin.bufId);
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glGenBuffers(1, &result.glyph.bufId);
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glGenBuffers(1, &result.fontSize.bufId);
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glGenBuffers(1, &result.color.bufId);
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glBindVertexArray(result.vao);
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int32 bufItemSize = sizeof(result.begin.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.begin.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.begin.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, bufItemSize, NULL);
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glVertexAttribDivisor(0, 1);
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glEnableVertexAttribArray(0);
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bufItemSize = sizeof(result.glyph.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.glyph.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.glyph.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribIPointer(1, 1, GL_INT, bufItemSize, NULL);
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glVertexAttribDivisor(1, 1);
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glEnableVertexAttribArray(1);
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bufItemSize = sizeof(result.fontSize.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.fontSize.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.fontSize.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, bufItemSize, NULL);
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glVertexAttribDivisor(2, 1);
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glEnableVertexAttribArray(2);
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bufItemSize = sizeof(result.color.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.color.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.color.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribPointer(3, 4, GL_FLOAT, GL_FALSE, bufItemSize, NULL);
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glVertexAttribDivisor(3, 1);
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glEnableVertexAttribArray(3);
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return result;
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}
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static RenderObjects_Rect createRectangleObjects(Arena *arena, size_t count) {
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RenderObjects_Rect result = {0};
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result.count = count;
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result.p0.buf = PushFullList(arena, Vec2List, count);
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result.p1.buf = PushFullList(arena, Vec2List, count);
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result.color.buf = PushFullList(arena, Vec4List, count);
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result.borderRadius.buf = PushFullList(arena, FloatList, count);
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result.borderThickness.buf = PushFullList(arena, FloatList, count);
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result.borderColor.buf = PushFullList(arena, Vec4List, count);
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result.edgeSoftness.buf = PushFullList(arena, FloatList, count);
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glGenVertexArrays(1, &result.vao);
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glGenBuffers(1, &result.p0.bufId);
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glGenBuffers(1, &result.p1.bufId);
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glGenBuffers(1, &result.color.bufId);
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glGenBuffers(1, &result.borderRadius.bufId);
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glGenBuffers(1, &result.borderThickness.bufId);
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glGenBuffers(1, &result.borderColor.bufId);
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glGenBuffers(1, &result.edgeSoftness.bufId);
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glBindVertexArray(result.vao);
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int32 bufItemSize = sizeof(result.p0.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.p0.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.p0.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, bufItemSize, NULL);
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glVertexAttribDivisor(0, 1);
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glEnableVertexAttribArray(0);
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bufItemSize = sizeof(result.p1.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.p1.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.p1.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, bufItemSize, NULL);
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glVertexAttribDivisor(1, 1);
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glEnableVertexAttribArray(1);
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bufItemSize = sizeof(result.color.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.color.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.color.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribPointer(2, 4, GL_FLOAT, GL_FALSE, bufItemSize, NULL);
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glVertexAttribDivisor(2, 1);
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glEnableVertexAttribArray(2);
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bufItemSize = sizeof(result.borderRadius.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.borderRadius.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.borderRadius.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribPointer(3, 1, GL_FLOAT, GL_FALSE, bufItemSize, NULL);
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glVertexAttribDivisor(3, 1);
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glEnableVertexAttribArray(3);
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bufItemSize = sizeof(result.borderThickness.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.borderThickness.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.borderThickness.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribPointer(4, 1, GL_FLOAT, GL_FALSE, bufItemSize, NULL);
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glVertexAttribDivisor(4, 1);
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glEnableVertexAttribArray(4);
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bufItemSize = sizeof(result.borderColor.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.borderColor.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.borderColor.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribPointer(5, 4, GL_FLOAT, GL_FALSE, bufItemSize, NULL);
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glVertexAttribDivisor(5, 1);
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glEnableVertexAttribArray(5);
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bufItemSize = sizeof(result.edgeSoftness.buf.data[0]);
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glBindBuffer(GL_ARRAY_BUFFER, result.edgeSoftness.bufId);
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glBufferData(GL_ARRAY_BUFFER, result.edgeSoftness.buf.length * bufItemSize, 0, GL_STREAM_DRAW);
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glVertexAttribPointer(6, 1, GL_FLOAT, GL_FALSE, bufItemSize, NULL);
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glVertexAttribDivisor(6, 1);
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glEnableVertexAttribArray(6);
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return result;
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}
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#define GL_UpdateBuffer(buffer) \
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glBindBuffer(GL_ARRAY_BUFFER, (buffer).bufId);\
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glBufferSubData(GL_ARRAY_BUFFER, 0, (buffer).buf.length * sizeof((buffer).underlying), (buffer).buf.data);
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static void updateCharObjectBuffers(Renderer *r) {
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glBindVertexArray(r->chars.vao);
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GL_UpdateBuffer(r->chars.begin);
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GL_UpdateBuffer(r->chars.glyph);
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GL_UpdateBuffer(r->chars.fontSize);
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GL_UpdateBuffer(r->chars.color);
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}
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static void updateRectangleObjectBuffers(Renderer *r) {
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glBindVertexArray(r->rects.vao);
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GL_UpdateBuffer(r->rects.p0);
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GL_UpdateBuffer(r->rects.p1);
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GL_UpdateBuffer(r->rects.color);
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GL_UpdateBuffer(r->rects.borderRadius);
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GL_UpdateBuffer(r->rects.borderThickness);
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GL_UpdateBuffer(r->rects.borderColor);
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GL_UpdateBuffer(r->rects.edgeSoftness);
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}
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Renderer createRenderer(Arena *arena, Scene *scene, Camera *cam, int32 light) {
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return (Renderer){
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.scene = scene,
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.light = light,
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.camera = cam,
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.rects = createRectangleObjects(arena, 1024),
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.chars = createCharObjects(arena, 10000),
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};
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}
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void renderBegin(Renderer *r) {
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r->rects.p0.buf.length = 0;
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r->rects.p1.buf.length = 0;
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r->rects.color.buf.length = 0;
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r->rects.borderRadius.buf.length = 0;
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r->rects.borderThickness.buf.length = 0;
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r->rects.borderColor.buf.length = 0;
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r->rects.edgeSoftness.buf.length = 0;
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r->chars.begin.buf.length = 0;
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r->chars.glyph.buf.length = 0;
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r->chars.fontSize.buf.length = 0;
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r->chars.color.buf.length = 0;
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r->sceneWidth = 0;
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r->sceneHeight = 0;
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r->sceneX = 0;
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r->sceneY = 0;
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}
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#define CHECK() do{ GLenum e=glGetError(); if(e) printf("GL err 0x%x at %s:%d\n",e,__FILE__,__LINE__); }while(0)
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void renderEnd(Renderer *r) {
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
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glEnable(GL_DEPTH_TEST);
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// --- 3D Scene ---
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glViewport(r->sceneX, r->height - r->sceneY - r->sceneHeight, r->sceneWidth, r->sceneHeight);
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cameraSetAspect(r->camera, r->sceneWidth, r->sceneHeight);
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glUseProgram(r->phongShader->progId);
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setUniformMat4fv(r->phongShader, "projection", &r->camera->proj);
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setUniformMat4fv(r->phongShader, "view", &r->camera->view);
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SceneGraphNode *lightGraphNode = getSceneGraphNode(r->scene, r->light);
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setUniform3fv(r->phongShader, "light_pos", &lightGraphNode->translation);
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setUniform3fv(r->phongShader, "camera", &r->camera->pos);
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//glBindVertexArray(r->cubeMesh->vao);
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int model_uniform = getUniformLocation(r->phongShader, "model");
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int solid_color_uniform = getUniformLocation(r->phongShader, "solid_color");
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for (EachIn(r->scene->entities, i)) {
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Entity *entity = &r->scene->entities.data[i];
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if (entity->flags & EntityFlags_Render && entity->flags & EntityFlags_Visible) {
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setUniform4fvByLoc(solid_color_uniform, &entity->color);
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setUniformMat4fvByLoc(model_uniform, &getSceneGraphNode(r->scene, entity->graphNodeHandle)->world);
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glBindTexture(GL_TEXTURE_2D, entity->tex->tex_id);
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glDrawArrays(GL_TRIANGLES, 0, (GLsizei)entity->mesh->num_indices);
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entity->flags &= ~EntityFlags_Render;
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}
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}
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// --- UI overlay ---
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glViewport(0, 0, r->width, r->height);
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glUseProgram(r->solidShader->progId);
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glDisable(GL_DEPTH_TEST);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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Matrix ortho = MatrixOrtho(0.0, r->width, r->height, 0.0, -1.0, 1.0);
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// - 1. Rects
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updateRectangleObjectBuffers(r);
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setUniformMat4fv(r->solidShader, "projection", &ortho);
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glBindVertexArray(r->rects.vao);
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glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, r->rects.p0.buf.length);
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// - 2. Text
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updateCharObjectBuffers(r);
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glUseProgram(r->textShader->progId);
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setUniformMat4fv(r->textShader, "projection", &ortho);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, r->activeFont->texId);
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_BUFFER, r->activeFont->glyphTableTexId);
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setUniform1i(r->textShader, "glyph_table", 1);
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glBindVertexArray(r->chars.vao);
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glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, r->chars.begin.buf.length);
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glDisable(GL_BLEND);
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glActiveTexture(GL_TEXTURE0);
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}
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void rendererPlaceRectangle(Renderer *r, real32 x, real32 y, real32 width, real32 height, Vec4 color, real32 borderRadius, real32 borderThickness, Vec4 borderColor) {
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x = roundf(x);
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y = roundf(y);
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width = roundf(width);
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height = roundf(height);
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ListAppend(r->rects.p0.buf, ((Vec2){ x, y }));
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ListAppend(r->rects.p1.buf, ((Vec2){ x + width, y + height }));
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ListAppend(r->rects.color.buf, color);
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ListAppend(r->rects.borderRadius.buf, borderRadius);
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ListAppend(r->rects.borderThickness.buf, borderThickness);
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ListAppend(r->rects.borderColor.buf, borderColor);
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ListAppend(r->rects.edgeSoftness.buf, 0.15f);
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}
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void rendererPlaceString(Renderer *r, string s, real32 x, real32 y, Vec4 color, real32 fontSize) {
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real32 ratio = fontSize / r->activeFont->lineHeight;
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real32 charWidth = ratio * r->activeFont->charWidth;
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for (int i = 0; i < s.length; i++) {
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ListAppend(r->chars.begin.buf, ((Vec2){ .x=x + i*charWidth, .y=y }));
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ListAppend(r->chars.glyph.buf, s.str[i] - 32);
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ListAppend(r->chars.fontSize.buf, ratio);
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ListAppend(r->chars.color.buf, (color));
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}
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}
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