Return to project, refactoring
This commit is contained in:
Krzosa Karol
391
src/render/opengl.cpp
Normal file
391
src/render/opengl.cpp
Normal file
@@ -0,0 +1,391 @@
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struct Shader {
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uint32_t pipeline;
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uint32_t fshader;
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uint32_t vshader;
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};
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Shader CreateShader(char *glsl_vshader, char *glsl_fshader);
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struct Vertex2D {
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Vec2 pos;
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Vec2 tex;
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Color color;
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};
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struct VertexNode2D {
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VertexNode2D *next;
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int count;
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Vertex2D vertices[1024 * 16];
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Rect2 scissor;
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};
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struct VertexList2D {
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VertexNode2D *first;
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VertexNode2D *last;
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};
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VertexList2D Vertices;
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int64_t TotalVertexCount;
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unsigned VBO, VAO;
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Shader Shader2D;
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Arena RenderArena;
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Rect2 CurrentScissor;
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Font MainFont;
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Int FontLineSpacing;
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Int FontCharSpacing;
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void BeginFrameRender(float wx, float wy) {
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Clear(&RenderArena);
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TotalVertexCount = 0;
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Vertices.first = NULL;
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Vertices.last = NULL;
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CurrentScissor = Rect0Size(wx, wy);
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}
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void EndFrameRender(float wx, float wy, Color color) {
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glEnable(GL_BLEND);
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glEnable(GL_SCISSOR_TEST);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_CULL_FACE);
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glViewport(0, 0, (GLsizei)wx, (GLsizei)wy);
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glScissor(0, 0, (GLsizei)wx, (GLsizei)wy);
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glClearColor(color.r, color.g, color.b, color.a);
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glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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// Default draw using the font texture
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glBindProgramPipeline(Shader2D.pipeline);
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float xinverse = 1.f / (wx / 2.f);
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float yinverse = 1.f / (wy / 2.f);
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glProgramUniform2f(Shader2D.vshader, 0, xinverse, yinverse);
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for (VertexNode2D *it = Vertices.first; it; it = it->next) {
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Rect2 rect = it->scissor;
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GLint x = (GLint)rect.min.x;
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GLint y = (GLint)rect.min.y;
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GLsizei w = (GLsizei)(rect.max.x - x);
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GLsizei h = (GLsizei)(rect.max.y - y);
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glScissor(x, (GLint)wy - (GLint)rect.max.y, w, h);
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glNamedBufferSubData(VBO, 0, it->count * sizeof(Vertex2D), it->vertices);
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glBindVertexArray(VAO);
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GLint s_texture = 0; // texture unit that sampler2D will use in GLSL code
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glBindTextureUnit(s_texture, MainFont.texture_id);
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glDrawArrays(GL_TRIANGLES, 0, it->count);
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}
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}
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void GLDebugCallback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar *message, const void *user) {
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printf("%s", message);
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if (severity == GL_DEBUG_SEVERITY_HIGH || severity == GL_DEBUG_SEVERITY_MEDIUM) {
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SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "OpenGL error", message, NULL);
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}
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}
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void InitRender() {
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InitArena(&RenderArena);
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glDebugMessageCallback(&GLDebugCallback, NULL);
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glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
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glCreateBuffers(1, &VBO);
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glNamedBufferStorage(VBO, Lengthof(VertexNode2D::vertices) * sizeof(Vertex2D), 0, GL_DYNAMIC_STORAGE_BIT);
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glCreateVertexArrays(1, &VAO);
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GLint vbuf_index = 0;
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glVertexArrayVertexBuffer(VAO, vbuf_index, VBO, 0, sizeof(struct Vertex2D));
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GLint a_pos = 0;
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glVertexArrayAttribFormat(VAO, a_pos, 2, GL_FLOAT, GL_FALSE, offsetof(struct Vertex2D, pos));
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glVertexArrayAttribBinding(VAO, a_pos, vbuf_index);
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glEnableVertexArrayAttrib(VAO, a_pos);
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GLint a_tex = 1;
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glVertexArrayAttribFormat(VAO, a_tex, 2, GL_FLOAT, GL_FALSE, offsetof(struct Vertex2D, tex));
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glVertexArrayAttribBinding(VAO, a_tex, vbuf_index);
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glEnableVertexArrayAttrib(VAO, a_tex);
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GLint a_color = 2;
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glVertexArrayAttribFormat(VAO, a_color, 4, GL_UNSIGNED_BYTE, GL_FALSE, offsetof(struct Vertex2D, color));
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glVertexArrayAttribBinding(VAO, a_color, vbuf_index);
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glEnableVertexArrayAttrib(VAO, a_color);
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char *glsl_vshader = R"==(
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#version 450 core
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layout(location=0) uniform vec2 U_InvHalfScreenSize;
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layout(location=0) in vec2 VPos;
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layout(location=1) in vec2 VTex;
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layout(location=2) in vec4 VColor;
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out gl_PerVertex { vec4 gl_Position; }; // required because of ARB_separate_shader_objects
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out vec2 FUV;
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out vec4 FColor;
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void main() {
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vec2 pos = VPos * U_InvHalfScreenSize;
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pos.y = 2 - pos.y; // invert y axis
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pos -= vec2(1, 1); // convert to 0,1 range
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gl_Position = vec4(pos, 0, 1);
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FUV = VTex;
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FColor = VColor / 255.0;
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}
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)==";
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char *glsl_fshader = R"==(
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#version 450 core
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in vec2 FUV;
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in vec4 FColor;
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layout (binding=0) uniform sampler2D S_Texture;
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layout (location=0) out vec4 OutColor;
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void main() {
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vec4 c = FColor;
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c.a *= texture(S_Texture, FUV).r;
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OutColor = c;
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}
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)==";
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Shader2D = CreateShader(glsl_vshader, glsl_fshader);
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}
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Shader CreateShader(char *glsl_vshader, char *glsl_fshader) {
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Shader result = {};
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result.vshader = glCreateShaderProgramv(GL_VERTEX_SHADER, 1, &glsl_vshader);
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result.fshader = glCreateShaderProgramv(GL_FRAGMENT_SHADER, 1, &glsl_fshader);
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GLint linked;
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glGetProgramiv(result.vshader, GL_LINK_STATUS, &linked);
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if (!linked) {
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char message[1024];
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glGetProgramInfoLog(result.vshader, sizeof(message), NULL, message);
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SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Failed to create vertex shader!", message, NULL);
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}
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glGetProgramiv(result.fshader, GL_LINK_STATUS, &linked);
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if (!linked) {
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char message[1024];
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glGetProgramInfoLog(result.fshader, sizeof(message), NULL, message);
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SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Failed to create fragment shader!", message, NULL);
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}
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glGenProgramPipelines(1, &result.pipeline);
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glUseProgramStages(result.pipeline, GL_VERTEX_SHADER_BIT, result.vshader);
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glUseProgramStages(result.pipeline, GL_FRAGMENT_SHADER_BIT, result.fshader);
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return result;
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}
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#define SLL_QUEUE_ADD_MOD(f, l, n, next) \
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do { \
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(n)->next = 0; \
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if ((f) == 0) { \
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(f) = (l) = (n); \
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} else { \
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(l) = (l)->next = (n); \
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} \
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} while (0)
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#define SLL_QUEUE_ADD(f, l, n) SLL_QUEUE_ADD_MOD(f, l, n, next)
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VertexNode2D *AllocVertexNode2D(Allocator allocator, VertexList2D *list) {
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VertexNode2D *node = AllocType(allocator, VertexNode2D);
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SLL_QUEUE_ADD(list->first, list->last, node);
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return node;
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}
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void SetScissor(Rect2 rect) {
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CurrentScissor = rect;
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VertexNode2D *node = Vertices.last;
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if (!node) {
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node = AllocVertexNode2D(RenderArena, &Vertices);
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node->scissor = rect;
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return;
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}
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if (node->scissor != rect && node->count == 0) {
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node->scissor = rect;
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return;
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}
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if (node->scissor != rect) {
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node = AllocVertexNode2D(RenderArena, &Vertices);
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node->scissor = rect;
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return;
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}
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}
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void SetScissor(Rect2I rect) { SetScissor(ToRect2(rect)); }
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Vertex2D *AllocVertex2D(Allocator allocator, VertexList2D *list, int count) {
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VertexNode2D *node = list->last;
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if (node == 0 || node->count + count > Lengthof(node->vertices)) {
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node = AllocVertexNode2D(allocator, list);
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node->scissor = CurrentScissor;
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}
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TotalVertexCount += count;
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Vertex2D *result = node->vertices + node->count;
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node->count += count;
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return result;
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}
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void PushVertex2D(Allocator allocator, VertexList2D *list, Vertex2D *vertices, int count) {
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Vertex2D *result = AllocVertex2D(allocator, list, count);
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for (int i = 0; i < count; i += 1) result[i] = vertices[i];
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}
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void PushQuad2D(Allocator arena, VertexList2D *list, Rect2 rect, Rect2 tex, Color color, float rotation = 0.f, Vec2 rotation_point = {}) {
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Vertex2D *v = AllocVertex2D(arena, list, 6);
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v[0] = {
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{rect.min.x, rect.max.y},
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{ tex.min.x, tex.max.y},
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color
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};
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v[1] = {
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{rect.max.x, rect.max.y},
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{ tex.max.x, tex.max.y},
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color
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};
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v[2] = {
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{rect.min.x, rect.min.y},
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{ tex.min.x, tex.min.y},
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color
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};
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v[3] = {
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{rect.min.x, rect.min.y},
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{ tex.min.x, tex.min.y},
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color
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};
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v[4] = {
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{rect.max.x, rect.max.y},
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{ tex.max.x, tex.max.y},
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color
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};
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v[5] = {
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{rect.max.x, rect.min.y},
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{ tex.max.x, tex.min.y},
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color
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};
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if (rotation != 0.f) {
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float s = sinf(rotation);
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float c = cosf(rotation);
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for (int i = 0; i < 6; i += 1) {
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v[i].pos -= rotation_point;
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v[i].pos = {v[i].pos.x * c + v[i].pos.y * (-s), v[i].pos.x * s + v[i].pos.y * c};
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v[i].pos += rotation_point;
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}
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}
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}
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void DrawRect(Rect2 rect, Color color) {
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PushQuad2D(RenderArena, &Vertices, rect, MainFont.white_texture_bounding_box, color);
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}
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void DrawRect(Rect2I rect, Color color) {
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PushQuad2D(RenderArena, &Vertices, ToRect2(rect), MainFont.white_texture_bounding_box, color);
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}
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void DrawRectOutline(Rect2 rect, Color color, float thickness = 2) {
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Rect2 a = CutLeft(&rect, thickness);
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Rect2 b = CutRight(&rect, thickness);
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Rect2 c = CutTop(&rect, thickness);
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Rect2 d = CutBottom(&rect, thickness);
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PushQuad2D(RenderArena, &Vertices, a, MainFont.white_texture_bounding_box, color);
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PushQuad2D(RenderArena, &Vertices, b, MainFont.white_texture_bounding_box, color);
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PushQuad2D(RenderArena, &Vertices, c, MainFont.white_texture_bounding_box, color);
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PushQuad2D(RenderArena, &Vertices, d, MainFont.white_texture_bounding_box, color);
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}
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void DrawRectOutline(Rect2I rect, Color color, Int thickness = 2) {
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DrawRectOutline(ToRect2(rect), color, (float)thickness);
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}
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Int GetCharSpacing(Font *font, int codepoint = '_') {
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Glyph *g = GetGlyph(font, codepoint);
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if (g->xadvance) return (Int)g->xadvance;
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return (Int)g->size.x;
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}
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Int GetLineSpacing(Font *font) {
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Int result = (Int)(font->ascent - font->descent + font->line_gap);
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return result;
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}
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Vec2 DrawString(Font *font, String16 string, Vec2 pos, Color color, bool draw = true) {
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pos.y += GetLineSpacing(font) + font->descent;
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Vec2 original_pos = pos;
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For(string) {
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Glyph *g = GetGlyph(font, it);
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Rect2 rect = Rect2FromSize(pos + g->offset, g->size);
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if (draw && it != '\n' && it != ' ' && it != '\t') {
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PushQuad2D(RenderArena, &Vertices, rect, g->atlas_bounding_box, color);
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}
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pos.x += g->xadvance;
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}
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Vec2 result = {pos.x - original_pos.x, font->size};
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return result;
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}
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#define PI32 3.14159265359f
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void DrawCircle(Vec2 pos, float radius, Color color) {
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const int segment_count = 16;
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const int vertex_count = segment_count * 3;
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Vec2 points[segment_count + 1];
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for (int i = 0; i < Lengthof(points); i += 1) {
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float radians = 2.0f * PI32 * float(i) / float(segment_count);
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float x = radius * cosf(radians);
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float y = radius * sinf(radians);
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points[i] = {x, y};
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}
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points[segment_count] = points[0]; // wrap around
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Vertex2D *vertices = AllocVertex2D(RenderArena, &Vertices, vertex_count);
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int point_i = 0;
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int segment_i = 0;
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for (; segment_i < vertex_count; segment_i += 3, point_i += 1) {
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Rect2 tex = MainFont.white_texture_bounding_box;
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Vertex2D *it = vertices + segment_i;
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it[0].color = color;
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it[1].color = color;
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it[2].color = color;
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it[0].tex = {tex.min.x, tex.max.y};
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it[1].tex = {tex.max.x, tex.max.y};
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it[2].tex = {tex.min.x, tex.min.y};
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it[0].pos = {pos + points[point_i]};
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it[1].pos = {pos + points[point_i + 1]};
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it[2].pos = {pos};
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}
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}
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void ReloadFont() {
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Int size = StyleFontSize;
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size = ClampBottom((Int)2, size);
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if (MainFont.texture_id) {
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glDeleteTextures(1, &MainFont.texture_id);
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Dealloc(&MainFont.glyphs);
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MainFont = {};
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}
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Scratch scratch;
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Atlas atlas = CreateAtlas(scratch, {2048, 2048});
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MainFont = CreateFont(&atlas, (uint32_t)size, StyleFont);
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{
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GLint filter = GL_NEAREST;
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if (StyleFontFilter == 1) filter = GL_LINEAR;
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glCreateTextures(GL_TEXTURE_2D, 1, &atlas.texture_id);
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glTextureParameteri(atlas.texture_id, GL_TEXTURE_MIN_FILTER, filter);
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glTextureParameteri(atlas.texture_id, GL_TEXTURE_MAG_FILTER, filter);
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glTextureParameteri(atlas.texture_id, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTextureParameteri(atlas.texture_id, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTextureStorage2D(atlas.texture_id, 1, GL_R8, (GLsizei)atlas.size.x, (GLsizei)atlas.size.y);
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glTextureSubImage2D(atlas.texture_id, 0, 0, 0, (GLsizei)atlas.size.x, (GLsizei)atlas.size.y, GL_RED, GL_UNSIGNED_BYTE, atlas.bitmap);
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}
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MainFont.texture_id = atlas.texture_id;
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FontCharSpacing = GetCharSpacing(&MainFont);
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FontLineSpacing = GetLineSpacing(&MainFont);
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}
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