/* * Mr. 4th Dimention - Allen Webster * * 10.11.2017 * * OpenGL render implementation * */ // TOP // TODO(allen): If we don't actually need this then burn down 4ed_opengl_funcs.h // Declare function types and function pointers //#define GL_FUNC(N,R,P) typedef R (N##_Function) P; N##_Function *P = 0; //#include "4ed_opengl_funcs.h" #include "4ed_opengl_defines.h" // OpenGL 2.1 implementation internal GLuint private_texture_initialize(GLint tex_width, GLint tex_height, u32 *pixels){ GLuint tex; glGenTextures(1, &tex); glBindTexture(GL_TEXTURE_2D, tex); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0); glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, tex_width, tex_height, 0, GL_ALPHA, GL_UNSIGNED_INT, pixels); return(tex); } inline void private_draw_bind_texture(Render_Target *t, i32 texid){ if (t->bound_texture != texid){ glBindTexture(GL_TEXTURE_2D, texid); t->bound_texture = texid; } } inline void private_draw_set_color(Render_Target *t, u32 color){ if (t->color != color){ t->color = color; Vec4 c = unpack_color4(color); glColor4f(c.r, c.g, c.b, c.a); } } internal void interpret_render_buffer(Render_Target *t){ local_persist b32 first_opengl_call = true; if (first_opengl_call){ first_opengl_call = false; char *vendor = (char *)glGetString(GL_VENDOR); char *renderer = (char *)glGetString(GL_RENDERER); char *version = (char *)glGetString(GL_VERSION); LOGF("GL_VENDOR: %s\n", vendor); LOGF("GL_RENDERER: %s\n", renderer); LOGF("GL_VERSION: %s\n", version); // TODO(allen): Get this up and running for dev mode again. #if (defined(BUILD_X64) && 0) || (defined(BUILD_X86) && 0) // NOTE(casey): This slows down GL but puts error messages to // the debug console immediately whenever you do something wrong void CALL_CONVENTION gl_dbg(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const char *message, const void *userParam); glDebugMessageCallback_type *glDebugMessageCallback = (glDebugMessageCallback_type *)win32_load_gl_always("glDebugMessageCallback", module); glDebugMessageControl_type *glDebugMessageControl = (glDebugMessageControl_type *)win32_load_gl_always("glDebugMessageControl", module); if(glDebugMessageCallback != 0 && glDebugMessageControl != 0) { glDebugMessageCallback(opengl_debug_callback, 0); glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, 0, GL_TRUE); glEnable(GL_DEBUG_OUTPUT); glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS); } #endif glEnable(GL_TEXTURE_2D); glEnable(GL_SCISSOR_TEST); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); } i32 width = t->width; i32 height = t->height; glViewport(0, 0, width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0, width, height, 0, -1, 1); glScissor(0, 0, width, height); glClearColor(1.f, 0.f, 1.f, 1.f); glClear(GL_COLOR_BUFFER_BIT); glBindTexture(GL_TEXTURE_2D, 0); t->bound_texture = 0; glColor4f(0.f, 0.f, 0.f, 0.f); t->color = 0; for (Render_Free_Texture *free_texture = t->free_texture_first; free_texture != 0; free_texture = free_texture->next){ glDeleteTextures(1, &free_texture->tex_id); } sll_clear(t->free_texture_first, t->free_texture_last); u8 *start = (u8*)t->buffer.base; u8 *end = (u8*)t->buffer.base + t->buffer.pos; Render_Command_Header *header = 0; for (u8 *p = start; p < end; p += header->size){ header = (Render_Command_Header*)p; i32 type = header->type; switch (type){ case RenCom_Rectangle: { Render_Command_Rectangle *rectangle = (Render_Command_Rectangle*)header; f32_Rect r = rectangle->rect; private_draw_set_color(t, rectangle->color); private_draw_bind_texture(t, 0); glBegin(GL_QUADS); { glVertex2f(r.x0, r.y0); glVertex2f(r.x0, r.y1); glVertex2f(r.x1, r.y1); glVertex2f(r.x1, r.y0); } glEnd(); }break; case RenCom_Outline: { Render_Command_Rectangle *rectangle = (Render_Command_Rectangle*)header; f32_Rect r = get_inner_rect(rectangle->rect, .5f); private_draw_set_color(t, rectangle->color); private_draw_bind_texture(t, 0); glBegin(GL_LINE_STRIP); { glVertex2f(r.x0, r.y0); glVertex2f(r.x1, r.y0); glVertex2f(r.x1, r.y1); glVertex2f(r.x0, r.y1); glVertex2f(r.x0, r.y0); } glEnd(); }break; case RenCom_Glyph: { Render_Command_Glyph *glyph = (Render_Command_Glyph*)header; Font_Pointers font = system_font_get_pointers_by_id(glyph->font_id); if (!font.valid){ break; } u32 codepoint = glyph->codepoint; u32 page_number = codepoint/GLYPHS_PER_PAGE; Glyph_Page *page = font_cached_get_page(font.pages, page_number); if (page == 0){ break; } if (!page->has_gpu_setup){ Partition *part = &target.buffer; Temp_Memory temp = begin_temp_memory(part); i32 tex_width = 0; i32 tex_height = 0; u32 *pixels = font_load_page_pixels(part, font.settings, page, page_number, &tex_width, &tex_height); page->has_gpu_setup = true; page->gpu_tex = private_texture_initialize(tex_width, tex_height, pixels); end_temp_memory(temp); } if (page->gpu_tex == 0){ break; } u32 glyph_index = codepoint%GLYPHS_PER_PAGE; Glyph_Bounds bounds = page->glyphs[glyph_index]; GLuint tex = page->gpu_tex; i32 tex_width = page->tex_width; i32 tex_height = page->tex_height; f32 x = glyph->pos.x; f32 y = glyph->pos.y; f32_Rect xy = {0}; xy.x0 = x + bounds.xoff; xy.y0 = y + bounds.yoff; xy.x1 = x + bounds.xoff2; xy.y1 = y + bounds.yoff2; // TODO(allen): Why aren't these baked in??? f32 unit_u = 1.f/tex_width; f32 unit_v = 1.f/tex_height; f32_Rect uv = {0}; uv.x0 = bounds.x0*unit_u; uv.y0 = bounds.y0*unit_v; uv.x1 = bounds.x1*unit_u; uv.y1 = bounds.y1*unit_v; private_draw_set_color(t, glyph->color); private_draw_bind_texture(t, tex); glBegin(GL_QUADS); { glTexCoord2f(uv.x0, uv.y1); glVertex2f(xy.x0, xy.y1); glTexCoord2f(uv.x1, uv.y1); glVertex2f(xy.x1, xy.y1); glTexCoord2f(uv.x1, uv.y0); glVertex2f(xy.x1, xy.y0); glTexCoord2f(uv.x0, uv.y0); glVertex2f(xy.x0, xy.y0); } glEnd(); if (codepoint != ' ' && font.settings->parameters.underline){ glDisable(GL_TEXTURE_2D); f32 x0 = x; f32 x1 = x + page->advance[glyph_index]; f32 yoff1 = y + font.metrics->underline_yoff1; f32 yoff2 = y + font.metrics->underline_yoff2; glBegin(GL_QUADS); { glVertex2f(x0, yoff1); glVertex2f(x1, yoff1); glVertex2f(x1, yoff2); glVertex2f(x0, yoff2); } glEnd(); glEnable(GL_TEXTURE_2D); } }break; case RenCom_ChangeClip: { Render_Command_Change_Clip *clip = (Render_Command_Change_Clip*)header; i32_Rect box = clip->box; glScissor(box.x0, height - box.y1, box.x1 - box.x0, box.y1 - box.y0); }break; } } glFlush(); } // BOTTOM