Added frame buffer support.

assets/shaders/textured.frag

@@ -8,5 +8,6 @@ out vec4 FragColor;
 
 void main() {
   vec4 color = texture(u_Text, TexCoord);
-  FragColor = color;
+  FragColor = color + vec4(0.25, 0.25, 0.25, 1);
+  // FragColor = vec4(1, 0, 0, 1);
 }

include/dawn/dawn.h

@@ -8,6 +8,7 @@
 
 // Display / Rendering
 #include "display/camera.h"
+#include "display/framebuffer.h"
 #include "display/primitive.h"
 #include "display/render.h"
 #include "display/shader.h"

include/dawn/display/framebuffer.h

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "../libs.h"
+#include "texture.h"
+
+typedef struct {
+  GLuint fboId;
+  GLuint rboId;
+  texture_t *texture;
+} framebuffer_t;

include/dawn/display/texture.h

@@ -19,5 +19,5 @@ typedef struct {
 
 /** Information about a single pixel. */
 typedef struct {
-  uint8_t r, g, b, a ;
+  uint8_t r, g, b, a;
 } pixel_t;

src/display/framebuffer.c

@@ -0,0 +1,68 @@
+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "framebuffer.h"
+
+framebuffer_t * frameBufferCreate(int32_t w, int32_t h) {
+  framebuffer_t *fb = malloc(sizeof(framebuffer_t));
+  if(fb == NULL) return NULL;
+
+  // Create Color Attachment texture.
+  fb->texture = textureCreate(w, h, NULL);
+  if(fb->texture == NULL) {
+    free(fb);
+    return NULL;
+  }
+
+  // Create Frame Buffer
+  glGenFramebuffers(1, &fb->fboId);
+  glBindFramebuffer(GL_FRAMEBUFFER, fb->fboId);
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+    GL_TEXTURE_2D, fb->texture->id, 0
+  );
+
+  // Render Buffer
+  glGenRenderbuffers(1, &fb->rboId);
+  glBindRenderbuffer(GL_RENDERBUFFER, fb->rboId); 
+  glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, w, h);
+  glBindRenderbuffer(GL_RENDERBUFFER, 0);
+  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
+    GL_RENDERBUFFER, fb->rboId
+  );
+
+  if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+    uint32_t error;
+    error = 0;
+  }
+
+  glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+  return fb;
+}
+
+void frameBufferUse(framebuffer_t *frameBuffer, bool clear) {
+  if(frameBuffer == NULL) {
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    glViewport(0, 0, RENDER_STATE.width, RENDER_STATE.height);
+  } else {
+    glBindFramebuffer(GL_FRAMEBUFFER, frameBuffer->fboId);
+    glViewport(0, 0, frameBuffer->texture->width, frameBuffer->texture->height);
+  }
+
+  if(clear) {
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  }
+}
+
+void frameBufferDispose(framebuffer_t *frameBuffer) {
+  glBindFramebuffer(GL_FRAMEBUFFER, 0);
+  glBindRenderbuffer(GL_RENDERBUFFER, 0);
+  glDeleteRenderbuffers(1, &frameBuffer->rboId);
+  glDeleteFramebuffers(1, &frameBuffer->fboId);
+  textureDispose(frameBuffer->texture);
+  free(frameBuffer);
+}

src/display/framebuffer.h

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include <dawn/dawn.h>
+#include "texture.h"
+
+/**
+ * Creates a new frame buffer that can be rendered to.
+ * 
+ * @param width Width of the frame buffer (in pixels).
+ * @param height Height of the frame buffer (in pixels).
+ * @return A renderable frame buffer.
+ */
+framebuffer_t * frameBufferCreate(int32_t width, int32_t height);
+
+/**
+ * Use a given frame buffer as the current rendering context.
+ * 
+ * @param frameBuffer Frame buffer to use, or NULL to not use any.
+ * @param clear Whether or not to clear the frame buffer prior to rendering.
+ */
+void frameBufferUse(framebuffer_t *frameBuffer, bool clear);
+
+/**
+ * Dispose/cleanup a previously created frame buffer.
+ * 
+ * @param frameBuffer Frame Buffer to clean.
+ */
+void frameBufferDispose(framebuffer_t *frameBuffer);

src/display/gui/font.h

@@ -11,7 +11,28 @@
 
 #define FONT_CHAR_START 33
 
+/**
+ * Get the division for a given character.
+ * 
+ * @param tileset Tileset to get the division from.
+ * @param character Character to get the division for.
+ * @return The division from the tileset for the character.
+ */
 tilesetdiv_t * fontGetCharacterDivision(tileset_t *tileset, char character);
+
+/**
+ * Renders a set of font characters to the sprite. Coordinates are anchored to
+ * the top left (0,0) origin.
+ * 
+ * @param batch Sprite Batch to render to.
+ * @param tileset Tileset for the font.
+ * @param string String to render.
+ * @param x Position in X space.
+ * @param y Position in Y space.
+ * @param z Position in Z space.
+ * @param charWidth Width of each character.
+ * @param charHeight Height of each character.
+ */
 void fontSpriteBatchBuffer(spritebatch_t *batch, tileset_t *tileset,
   char *string, float x, float y, float z, float charWidth, float charHeight
 );

src/display/render.c

@@ -32,5 +32,4 @@ void renderDispose() {
 void renderSetResolution(int32_t width, int32_t height) {
   RENDER_STATE.width = width;
   RENDER_STATE.height = height;
-  glViewport(0, 0, width, height);
 }

src/display/texture.c

@@ -41,6 +41,8 @@ texture_t * textureCreate(int32_t width, int32_t height, pixel_t *pixels) {
       GL_RGBA, GL_UNSIGNED_BYTE, pixels
     );
   }
+  
+  glBindTexture(GL_TEXTURE_2D, 0);
 
   return texture;
 }

src/game/game.c

@@ -9,11 +9,9 @@
 
 game_t GAME_STATE;
 
-holdemgame_t holdem;
-holdemrender_t render;
-
-texture_t *fontTexture;
-spritebatch_t *fontBatch;
+primitive_t *prim;
+framebuffer_t *fbo;
+texture_t *text;
 
 bool gameInit() {
   // Init the game
@@ -25,29 +23,14 @@ bool gameInit() {
   inputInit();
   worldInit();
 
-  holdemGameInit(&holdem);
-  holdemRenderInit(&render);
+  prim = cubeCreate(1, 1, 1);
+  text = assetTextureLoad("bruh.png");
 
-  holdemRoundInit(&holdem);
-  cardShuffle(holdem.deck, holdem.deckSize);
-
-  // Deal Card
-  holdemDealAll(&holdem, 2);
-  holdemFlop(&holdem);
-
-  fontTexture = assetTextureLoad("font.png");
-  fontBatch = spriteBatchCreate(100);
-  tileset_t *tileset = tilesetCreate(20, 20,
-    fontTexture->width, fontTexture->height,
-    1, 1, 1, 1
-  );
-
-  char *buffer = "!\"#$%";
-  fontSpriteBatchBuffer(fontBatch, tileset, buffer, 0, 0, 0, 1.1, 1.5);
+  fbo = frameBufferCreate(128, 128);
 
   // Load the world shader.
   GAME_STATE.shaderWorld = assetShaderLoad(
-    "shaders/test.vert", "shaders/test.frag"
+    "shaders/textured.vert", "shaders/textured.frag"
   );
 
   // Init the input manger.
@@ -59,25 +42,27 @@ bool gameUpdate(float platformDelta) {
   renderFrameStart();
   inputUpdate();
 
-  // Attach the world shader
+  // Set up the camera and shader.
   shaderUse(GAME_STATE.shaderWorld);
+  frameBufferUse(fbo, true);
+  cameraLookAt(&GAME_STATE.cameraWorld, 2, 2, 2, 0, 0, 0);
+  cameraPerspective(&GAME_STATE.cameraWorld, 45.0f,
+    ((float)fbo->texture->width) / ((float)fbo->texture->height),
+    0.5f, 500.0f
+  );
+  shaderUseCamera(GAME_STATE.shaderWorld, &GAME_STATE.cameraWorld);
+  shaderUsePosition(GAME_STATE.shaderWorld, 0, 0, 0, TIME_STATE.current, TIME_STATE.current, 0);
+  shaderUseTexture(GAME_STATE.shaderWorld, text);
+  primitiveDraw(prim, 0, prim->indiceCount);
 
-  // Set up the camera.
-  int x = 10;
-  cameraLookAt(&GAME_STATE.cameraWorld, x, 2.5f, 50, x, 2, 0);
+  frameBufferUse(NULL, true);
+  shaderUseTexture(GAME_STATE.shaderWorld, fbo->texture);
   cameraPerspective(&GAME_STATE.cameraWorld, 45.0f,
     ((float)RENDER_STATE.width) / ((float)RENDER_STATE.height),
     0.5f, 500.0f
   );
   shaderUseCamera(GAME_STATE.shaderWorld, &GAME_STATE.cameraWorld);
-
-
-  shaderUseTexture(GAME_STATE.shaderWorld, fontTexture);
-  spriteBatchDraw(fontBatch, 0, -1);
-
-  // holdemRender(&render, &holdem);
-  // Render the game scene.
-  // worldRender();
+  primitiveDraw(prim, 0, prim->indiceCount);
 
   if(inputIsPressed(INPUT_NULL)) return false;
   return true;

src/game/game.h

@@ -11,13 +11,11 @@
 #include "../display/shader.h"
 #include "../file/asset.h"
 #include "../input/input.h"
-#include "../world/world.h"
-#include "../world/entity/entity.h"
 
-#include "../card/poker/holdem.h"
-#include "../display/gui/font.h"
-#include "../display/spritebatch.h"
-#include "../display/tileset.h"
+#include "../display/primitive.h"
+#include "../display/framebuffer.h"
+#include "../display/primitives/cube.h"
+#include "../display/primitives/quad.h"
 
 /**
  * Initialize the game context.