prog

2026-06-18 20:25:54 -05:00
parent 730a5b2b10
commit 57b2cdb9d1
111 changed files with 865 additions and 3328 deletions
@@ -0,0 +1,403 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "screen.h"
+#include "assert/assert.h"
+#include "util/memory.h"
+#include "display/mesh/quad.h"
+#include "display/shader/shaderunlit.h"
+
+screen_t SCREEN;
+
+errorret_t screenInit() {
+  memoryZero(&SCREEN, sizeof(screen_t));
+
+  SCREEN.background = COLOR_CORNFLOWER_BLUE;
+
+  #ifdef DUSK_DISPLAY_SIZE_DYNAMIC
+    SCREEN.mode = SCREEN_MODE_FIXED_VIEWPORT_HEIGHT;
+    SCREEN.fixedHeight.height = DUSK_DISPLAY_SCREEN_HEIGHT;
+
+    quadBuffer(
+      SCREEN.frameBufferMeshVertices,
+      0.0f, 0.0f,
+      1.0f, 1.0f,
+      0.0f, 0.0f,
+      1.0f, 1.0f
+      #if MESH_ENABLE_COLOR
+        , COLOR_WHITE
+      #endif
+    );
+    errorChain(meshInit(
+      &SCREEN.frameBufferMesh,
+      QUAD_PRIMITIVE_TYPE,
+      QUAD_VERTEX_COUNT,
+      SCREEN.frameBufferMeshVertices
+    ));
+  #endif
+
+  // Init screen to backbuffer mode by default
+  errorChain(screenBind());
+  errorOk();
+}
+
+errorret_t screenBind() {
+  // Assume backbuffer is currently bound.
+  switch(SCREEN.mode) {
+    case SCREEN_MODE_BACKBUFFER: {
+      // Screen mode backbuffer uses the full display size
+      SCREEN.width = frameBufferGetWidth(FRAMEBUFFER_BOUND);
+      SCREEN.height = frameBufferGetHeight(FRAMEBUFFER_BOUND);
+      SCREEN.aspect = frameBufferGetAspect(FRAMEBUFFER_BOUND);
+
+      // No needd for a framebuffer.
+      #ifdef DUSK_DISPLAY_SIZE_DYNAMIC
+        if(SCREEN.framebufferReady) {
+          errorChain(frameBufferDispose(&SCREEN.framebuffer));
+          SCREEN.framebufferReady = false;
+        }
+      #endif
+      break;
+    }
+
+    #ifdef DUSK_DISPLAY_SIZE_DYNAMIC
+      case SCREEN_MODE_FIXED_SIZE: {
+        SCREEN.width = SCREEN.fixedSize.width;
+        SCREEN.height = SCREEN.fixedSize.height;
+        SCREEN.aspect = (float_t)SCREEN.width / (float_t)SCREEN.height;
+
+        if(SCREEN.framebufferReady) {
+          // Is current framebuffer the correct size?
+          int32_t curFbWidth, curFbHeight;
+          curFbWidth = frameBufferGetWidth(&SCREEN.framebuffer);
+          curFbHeight = frameBufferGetHeight(&SCREEN.framebuffer);
+          if(curFbWidth == SCREEN.width && curFbHeight == SCREEN.height) {
+            // Correct size, nothing to do.
+            errorChain(frameBufferBind(&SCREEN.framebuffer));
+            errorOk();
+          }
+
+          // Need a new framebuffer.
+          errorChain(frameBufferDispose(&SCREEN.framebuffer));
+          SCREEN.framebufferReady = false;
+        }
+
+        // Create new framebuffer
+        errorChain(frameBufferInit(
+          &SCREEN.framebuffer, SCREEN.width, SCREEN.height
+        ));
+        SCREEN.framebufferReady = true;
+        errorChain(frameBufferBind(&SCREEN.framebuffer));
+        break;
+      }
+
+      case SCREEN_MODE_ASPECT_RATIO: {
+        // Aspect ratio mode, requires a framebuffer.
+        int32_t fbWidth, fbHeight;
+        fbWidth = frameBufferGetWidth(FRAMEBUFFER_BOUND);
+        fbHeight = frameBufferGetHeight(FRAMEBUFFER_BOUND);
+        float_t currentAspect = frameBufferGetAspect(FRAMEBUFFER_BOUND);
+        if(currentAspect == SCREEN.aspectRatio.ratio) {
+          // No need to use framebuffer.
+          SCREEN.width = fbWidth;
+          SCREEN.height = fbHeight;
+          SCREEN.aspect = (float_t)SCREEN.width / (float_t)SCREEN.height;
+
+          if(SCREEN.framebufferReady) {
+            errorChain(frameBufferDispose(&SCREEN.framebuffer));
+            SCREEN.framebufferReady = false;
+          }
+          errorOk();
+        }
+
+        int32_t newFbWidth, newFbHeight;
+        if(currentAspect > SCREEN.aspectRatio.ratio) {
+          // Wider than target aspect, limit by height
+          newFbWidth = (int32_t)floorf(fbHeight * SCREEN.aspectRatio.ratio);
+          newFbHeight = (int32_t)fbHeight;
+        } else {
+          // Taller than target aspect, limit by width
+          newFbHeight = (int32_t)floorf(fbWidth / SCREEN.aspectRatio.ratio);
+          newFbWidth = (int32_t)fbWidth;
+        }
+
+        if(SCREEN.framebufferReady) {
+          // Is current framebuffer the correct size?
+          int32_t curFbWidth, curFbHeight;
+          float_t curFbAspect = frameBufferGetAspect(&SCREEN.framebuffer);
+          curFbWidth = frameBufferGetWidth(&SCREEN.framebuffer);
+          curFbHeight = frameBufferGetHeight(&SCREEN.framebuffer);
+          if(curFbWidth == newFbWidth && curFbHeight == newFbHeight) {
+            // Correct size, nothing to do.
+            SCREEN.width = newFbWidth;
+            SCREEN.height = newFbHeight;
+            SCREEN.aspect = curFbAspect;
+            errorChain(frameBufferBind(&SCREEN.framebuffer));
+            errorOk();
+          }
+
+          // Need a new framebuffer.
+          errorChain(frameBufferDispose(&SCREEN.framebuffer));
+          SCREEN.framebufferReady = false;
+        }
+
+        // Create new framebuffer
+        errorChain(frameBufferInit(
+          &SCREEN.framebuffer, newFbWidth, newFbHeight
+        ));
+        SCREEN.width = newFbWidth;
+        SCREEN.height = newFbHeight;
+        SCREEN.aspect = (float_t)SCREEN.width / (float_t)SCREEN.height;
+        SCREEN.framebufferReady = true;
+
+        // Bind FB
+        errorChain(frameBufferBind(&SCREEN.framebuffer));
+        break;
+      }
+
+      case SCREEN_MODE_FIXED_HEIGHT: {
+        float_t fbWidth = (float_t)frameBufferGetWidth(FRAMEBUFFER_BOUND);
+        float_t fbHeight = (float_t)frameBufferGetHeight(FRAMEBUFFER_BOUND);
+        float_t fbAspect = fbWidth / fbHeight;
+
+        int32_t newFbWidth, newFbHeight;
+        newFbHeight = SCREEN.fixedHeight.height;
+        newFbWidth = (int32_t)floorf(newFbHeight * fbAspect);
+
+        SCREEN.width = newFbWidth;
+        SCREEN.height = newFbHeight;
+        SCREEN.aspect = (float_t)SCREEN.width / (float_t)SCREEN.height;
+
+        if(fbWidth == newFbWidth && fbHeight == newFbHeight) {
+          // No need to use framebuffer.
+          if(SCREEN.framebufferReady) {
+            errorChain(frameBufferDispose(&SCREEN.framebuffer));
+            SCREEN.framebufferReady = false;
+          }
+          errorOk();
+        }
+
+        if(SCREEN.framebufferReady) {
+          // Is current framebuffer the correct size?
+          int32_t curFbWidth, curFbHeight;
+          curFbWidth = frameBufferGetWidth(&SCREEN.framebuffer);
+          curFbHeight = frameBufferGetHeight(&SCREEN.framebuffer);
+          if(curFbWidth == newFbWidth && curFbHeight == newFbHeight) {
+            errorChain(frameBufferBind(&SCREEN.framebuffer));
+            errorOk();
+          }
+
+          // Need a new framebuffer.
+          errorChain(frameBufferDispose(&SCREEN.framebuffer));
+          SCREEN.framebufferReady = false;
+        }
+
+        // Create a new framebuffer.
+        errorChain(frameBufferInit(
+          &SCREEN.framebuffer, newFbWidth, newFbHeight
+        ));
+        SCREEN.framebufferReady = true;
+        errorChain(frameBufferBind(&SCREEN.framebuffer));
+        break;
+      }
+
+      case SCREEN_MODE_FIXED_WIDTH: {
+        float_t fbWidth = (float_t)frameBufferGetWidth(FRAMEBUFFER_BOUND);
+        float_t fbHeight = (float_t)frameBufferGetHeight(FRAMEBUFFER_BOUND);
+        float_t fbAspect = fbWidth / fbHeight;
+
+        int32_t newFbWidth, newFbHeight;
+        newFbWidth = SCREEN.fixedWidth.width;
+        newFbHeight = (int32_t)floorf(newFbWidth / fbAspect);
+
+        SCREEN.width = newFbWidth;
+        SCREEN.height = newFbHeight;
+        SCREEN.aspect = (float_t)SCREEN.width / (float_t)SCREEN.height;
+
+        if(fbWidth == newFbWidth && fbHeight == newFbHeight) {
+          // No need to use framebuffer.
+          if(SCREEN.framebufferReady) {
+            errorChain(frameBufferDispose(&SCREEN.framebuffer));
+            SCREEN.framebufferReady = false;
+          }
+          errorOk();
+        }
+
+        if(SCREEN.framebufferReady) {
+          // Is current framebuffer the correct size?
+          int32_t curFbWidth, curFbHeight;
+          curFbWidth = frameBufferGetWidth(&SCREEN.framebuffer);
+          curFbHeight = frameBufferGetHeight(&SCREEN.framebuffer);
+          if(curFbWidth == newFbWidth && curFbHeight == newFbHeight) {
+            errorChain(frameBufferBind(&SCREEN.framebuffer));
+            errorOk();
+          }
+
+          // Need a new framebuffer.
+          errorChain(frameBufferDispose(&SCREEN.framebuffer));
+          SCREEN.framebufferReady = false;
+        }
+
+        // Create a new framebuffer.
+        errorChain(frameBufferInit(
+          &SCREEN.framebuffer, newFbWidth, newFbHeight
+        ));
+        SCREEN.framebufferReady = true;
+        errorChain(frameBufferBind(&SCREEN.framebuffer));
+        break;
+      }
+
+      case SCREEN_MODE_FIXED_VIEWPORT_HEIGHT: {
+        SCREEN.height = SCREEN.fixedViewportHeight.height;
+        float_t fbWidth = (float_t)frameBufferGetWidth(FRAMEBUFFER_BOUND);
+        float_t fbHeight = (float_t)frameBufferGetHeight(FRAMEBUFFER_BOUND);
+        float_t fbAspect = fbWidth / fbHeight;
+        SCREEN.width = (int32_t)floorf(SCREEN.height * fbAspect);
+        SCREEN.aspect = (float_t)SCREEN.width / (float_t)SCREEN.height;
+        break;
+      }
+
+    #endif
+
+    default: {
+      assertUnreachable("Invalid screen mode.");
+      break;
+    }
+  }
+
+  errorOk();
+}
+
+errorret_t screenUnbind() {
+  switch(SCREEN.mode) {
+    // Nothing to do here.
+    case SCREEN_MODE_BACKBUFFER:
+      break;
+    
+    #ifdef DUSK_DISPLAY_SIZE_DYNAMIC
+      case SCREEN_MODE_ASPECT_RATIO:
+      case SCREEN_MODE_FIXED_HEIGHT:
+      case SCREEN_MODE_FIXED_SIZE:
+      case SCREEN_MODE_FIXED_WIDTH:
+        if(SCREEN.framebufferReady) {
+          errorChain(frameBufferBind(NULL));
+        }
+        break;
+
+      case SCREEN_MODE_FIXED_VIEWPORT_HEIGHT:
+        break;
+    #endif
+
+    default:
+      assertUnreachable("Invalid screen mode.");
+      break;
+  }
+
+  errorOk();
+}
+
+errorret_t screenRender() {
+  if(SCREEN.mode == SCREEN_MODE_BACKBUFFER) {
+    errorOk();
+  }
+
+  #ifdef DUSK_DISPLAY_SIZE_DYNAMIC
+    if(SCREEN.mode == SCREEN_MODE_FIXED_VIEWPORT_HEIGHT) {
+      glViewport(0, 0, SCREEN.width, SCREEN.height);
+      errorOk();
+    }
+
+    if(
+      SCREEN.mode == SCREEN_MODE_ASPECT_RATIO ||
+      SCREEN.mode == SCREEN_MODE_FIXED_HEIGHT ||
+      SCREEN.mode == SCREEN_MODE_FIXED_SIZE ||
+      SCREEN.mode == SCREEN_MODE_FIXED_WIDTH
+    ) {
+      if(!SCREEN.framebufferReady) {
+        // Nothing to do here.
+        errorOk();
+      }
+
+      float_t bbWidth, bbHeight;
+      bbWidth = (float_t)frameBufferGetWidth(FRAMEBUFFER_BOUND);
+      bbHeight = (float_t)frameBufferGetHeight(FRAMEBUFFER_BOUND);
+
+      float_t backBufferAspect = bbWidth / bbHeight;
+
+      // Determine framebuffer centering
+      float_t fbWidth, fbHeight, fbAspect;
+      float_t fbX, fbY;
+
+      fbWidth = frameBufferGetWidth(&SCREEN.framebuffer);
+      fbHeight = frameBufferGetHeight(&SCREEN.framebuffer);
+      fbAspect = fbWidth / fbHeight;
+      
+      if(backBufferAspect > fbAspect) {
+        fbHeight = bbHeight;
+        fbWidth = fbHeight * fbAspect;
+        fbX = (bbWidth - fbWidth) * 0.5f;
+        fbY = 0.0f;
+      } else {
+        fbWidth = bbWidth;
+        fbHeight = fbWidth / fbAspect;
+        fbX = 0.0f;
+        fbY = (bbHeight - fbHeight) * 0.5f;
+      }
+
+      // Determine back buffer matricies
+      float_t centerX = bbWidth * 0.5f;
+      float_t centerY = bbHeight * 0.5f;
+      mat4 view, proj, model;
+      glm_ortho(
+        0.0f, bbWidth, bbHeight, 0.0f, 0.01f, 1.0f,
+        proj
+      );
+      glm_mat4_identity(view);
+      glm_mat4_identity(model);
+      
+      quadBuffer(
+        SCREEN.frameBufferMeshVertices,
+        centerX - fbWidth * 0.5f, centerY + fbHeight * 0.5f, // top-left
+        centerX + fbWidth * 0.5f, centerY - fbHeight * 0.5f, // bottom-right
+        0.0f, 0.0f,
+        1.0f, 1.0f
+        #if MESH_ENABLE_COLOR
+          , COLOR_WHITE
+        #endif
+      );
+
+      frameBufferClear(
+        FRAMEBUFFER_CLEAR_COLOR | FRAMEBUFFER_CLEAR_DEPTH,
+        COLOR_BLACK
+      );
+
+      shaderBind(&SHADER_UNLIT);
+      shaderSetMatrix(&SHADER_UNLIT, SHADER_UNLIT_PROJECTION, proj);
+      shaderSetMatrix(&SHADER_UNLIT, SHADER_UNLIT_VIEW, view);
+      shaderSetMatrix(&SHADER_UNLIT, SHADER_UNLIT_MODEL, model);
+
+      // errorChain(textureBind(&SCREEN.framebuffer.texture));
+      errorChain(meshDraw(&SCREEN.frameBufferMesh, 0, -1));
+
+      errorOk();
+    };
+  #endif
+
+  assertUnreachable("Invalid screen mode.");
+  errorThrow("Invalid screen mode.");
+}
+
+errorret_t screenDispose() {
+  #ifdef DUSK_DISPLAY_SIZE_DYNAMIC
+    if(SCREEN.framebufferReady) {
+      errorChain(frameBufferDispose(&SCREEN.framebuffer));
+      SCREEN.framebufferReady = false;
+    }
+  #endif
+
+  errorOk();
+}