Add debug rendering, fix misaligned pos render bug

Rendering using a non-default quad specifies normalised coordinates
relative to the frame buffer size. Hence each render of these frames
should origin from (0,0) any other value is invalid.

Dengine.vcxproj

@@ -121,6 +121,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="src\AssetManager.c" />
+    <ClCompile Include="src\Common.c" />
     <ClCompile Include="src\dengine.c" />
     <ClCompile Include="src\Platform.c" />
     <ClCompile Include="src\Renderer.c" />

Dengine.vcxproj.filters

@@ -39,6 +39,9 @@
     <ClCompile Include="src\AssetManager.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="src\Common.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="data\shaders\default.vert.glsl" />

src/AssetManager.c

@@ -9,7 +9,7 @@
 #include "Dengine/Platform.h"
 #include "Dengine/AssetManager.h"
 
-#define WT_RENDER_FONT_FILE
+//#define WT_RENDER_FONT_FILE
 #ifdef WT_RENDER_FONT_FILE
 #define STB_IMAGE_WRITE_IMPLEMENTATION
 #include <STB/stb_image_write.h>
@@ -136,7 +136,7 @@ const i32 asset_loadTTFont(AssetManager *assetManager, const char *filePath)
 	    CAST(GlyphBitmap *) calloc(numGlyphs, sizeof(GlyphBitmap));
 	v2i largestGlyphDimension = V2i(0, 0);
 
-	const f32 targetFontHeight = 32.0f;
+	const f32 targetFontHeight = 20.0f;
 	f32 scaleY = stbtt_ScaleForPixelHeight(&fontInfo, targetFontHeight);
 
 	i32 ascent, descent, lineGap;

src/Common.c

@@ -0,0 +1,8 @@
+#include "Dengine\Common.h"
+
+i32 common_strlen(const char *const string)
+{
+	i32 result = 0;
+	while (string[result]) result++;
+	return result;
+}

src/Renderer.c

@@ -1,10 +1,140 @@
+#include "Dengine/Platform.h"
 #include "Dengine/OpenGL.h"
 #include "Dengine/Renderer.h"
 
 #define RENDER_BOUNDING_BOX FALSE
 
-void renderer_entity(Renderer *renderer, Entity *entity, f32 rotate, v3 color)
+DebugRenderer debugRenderer = {0};
+
+INTERNAL void updateBufferObject(Renderer *const renderer,
+                                 RenderQuad *const quads, const i32 numQuads)
 {
+	// TODO(doyle): We assume that vbo and vao are assigned
+	const i32 numVertexesInQuad = 4;
+	renderer->numVertexesInVbo = numQuads * numVertexesInQuad;
+
+	glBindBuffer(GL_ARRAY_BUFFER, renderer->vbo);
+	glBufferData(GL_ARRAY_BUFFER, numQuads * sizeof(RenderQuad), quads,
+	             GL_STREAM_DRAW);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+#if 0
+void renderer_backgroundTiles(Renderer *const renderer, const v2 tileSize,
+                              World *const world, TexAtlas *const atlas,
+                              Texture *const tex)
+{
+	RenderQuad worldQuads[ARRAY_COUNT(world->tiles)] = {0};
+	i32 quadIndex = 0;
+
+	for (i32 i = 0; i < ARRAY_COUNT(world->tiles); i++)
+	{
+		Tile tile = world->tiles[i];
+		v2 tilePosInPixel = v2_scale(tile.pos, tileSize.x);
+
+		if ((tilePosInPixel.x < renderer->size.w && tilePosInPixel.x >= 0) &&
+		    (tilePosInPixel.y < renderer->size.h && tilePosInPixel.y >= 0))
+		{
+			const v4 texRect  = atlas->texRect[terraincoords_ground];
+			const v4 tileRect = getRect(tilePosInPixel, tileSize);
+
+			RenderQuad tileQuad =
+			    renderer_createQuad(renderer, tileRect, texRect, tex);
+			worldQuads[quadIndex++] = tileQuad;
+		}
+	}
+
+	updateBufferObject(renderer, worldQuads, quadIndex);
+	renderer_object(renderer, V2(0.0f, 0.0f), renderer->size, 0.0f,
+	                V3(0, 0, 0), tex);
+}
+#endif
+
+void renderer_string(Renderer *const renderer, Font *const font,
+                     const char *const string, v2 pos, f32 rotate,
+                     v3 color)
+{
+	i32 quadIndex = 0;
+	i32 strLen = common_strlen(string);
+	RenderQuad *stringQuads = CAST(RenderQuad *)calloc(strLen, sizeof(RenderQuad));
+
+	f32 baseline = pos.y;
+	for (i32 i = 0; i < strLen; i++)
+	{
+		// NOTE(doyle): Atlas packs fonts tightly, so offset the codepoint to
+		// its actual atlas index, i.e. we skip the first 31 glyphs
+		i32 codepoint = string[i];
+		i32 relativeIndex = codepoint - font->codepointRange.x;
+		CharMetrics charMetric = font->charMetrics[relativeIndex];
+		pos.y = baseline - charMetric.offset.y;
+
+		const v4 charRectOnScreen = getRect(
+		    pos, V2(CAST(f32) font->maxSize.w, CAST(f32) font->maxSize.h));
+
+		pos.x += charMetric.advance;
+		
+		/* Get texture out */
+		v4 charTexRect = font->atlas->texRect[relativeIndex];
+		renderer_flipTexCoord(&charTexRect, FALSE, TRUE);
+
+		RenderQuad charQuad = renderer_createQuad(renderer, charRectOnScreen,
+		                                          charTexRect, font->tex);
+		stringQuads[quadIndex++] = charQuad;
+	}
+
+	// NOTE(doyle): We render at the renderer's size because we create quads
+	// relative to the window size, hence we also render at the origin since
+	// we're rendering a window sized buffer
+	updateBufferObject(renderer, stringQuads, quadIndex);
+	renderer_object(renderer, V2(0.0f, 0.0f), renderer->size, rotate, color,
+	                font->tex);
+	free(stringQuads);
+
+}
+
+void renderer_debugString(Renderer *const renderer, Font *const font,
+                          const char *const string)
+{
+	/* Intialise debug object */
+	if (!debugRenderer.init)
+	{
+		debugRenderer.stringPos =
+		    V2(0.0f, renderer->size.y -
+		                 (1.8f * asset_getVFontSpacing(font->metrics)));
+		debugRenderer.init = TRUE;
+	}
+
+	f32 rotate = 0;
+	v3 color = V3(0, 0, 0);
+	renderer_string(renderer, font, string, debugRenderer.stringPos, rotate,
+	                color);
+	debugRenderer.stringPos.y -= (0.9f * asset_getVFontSpacing(font->metrics));
+}
+
+void renderer_entity(Renderer *renderer, Entity *entity, f32 dt, f32 rotate,
+                     v3 color)
+{
+	SpriteAnim *anim = &entity->anim[entity->currAnimIndex];
+	v4 texRect       = anim->rect[anim->currRectIndex];
+
+	anim->currDuration -= dt;
+	if (anim->currDuration <= 0.0f)
+	{
+		anim->currRectIndex++;
+		anim->currRectIndex = anim->currRectIndex % anim->numRects;
+		texRect             = anim->rect[anim->currRectIndex];
+		anim->currDuration  = anim->duration;
+	}
+
+	if (entity->direction == direction_east)
+	{
+		// NOTE(doyle): Flip the x coordinates to flip the tex
+		renderer_flipTexCoord(&texRect, TRUE, FALSE);
+	}
+
+	RenderQuad entityQuad =
+	    renderer_createDefaultQuad(renderer, texRect, entity->tex);
+	updateBufferObject(renderer, &entityQuad, 1);
 	renderer_object(renderer, entity->pos, entity->size, rotate, color,
 	                entity->tex);
 }
@@ -73,9 +203,13 @@ RenderQuad renderer_createQuad(Renderer *renderer, v4 quadRect, v4 texRect,
 	texRectNdc.e[2] *= texNdcFactor.w;
 	texRectNdc.e[3] *= texNdcFactor.h;
 
-	result.vertex[0] = V4(quadRectNdc.x, quadRectNdc.y, texRectNdc.x, texRectNdc.y); // Top left
+	result.vertex[0] = V4(quadRectNdc.x, quadRectNdc.y, texRectNdc.x,
-	result.vertex[1] = V4(quadRectNdc.x, quadRectNdc.w, texRectNdc.x, texRectNdc.w); // Bottom left
+	                      texRectNdc.y); // Top left
-	result.vertex[2] = V4(quadRectNdc.z, quadRectNdc.y, texRectNdc.z, texRectNdc.y); // Top right
+	result.vertex[1] = V4(quadRectNdc.x, quadRectNdc.w, texRectNdc.x,
-	result.vertex[3] = V4(quadRectNdc.z, quadRectNdc.w, texRectNdc.z, texRectNdc.w); // Bottom right
+	                      texRectNdc.w); // Bottom left
+	result.vertex[2] = V4(quadRectNdc.z, quadRectNdc.y, texRectNdc.z,
+	                      texRectNdc.y); // Top right
+	result.vertex[3] = V4(quadRectNdc.z, quadRectNdc.w, texRectNdc.z,
+	                      texRectNdc.w); // Bottom right
 	return result;
 }

src/WorldTraveller.c

@@ -6,19 +6,6 @@
 //choose to load assets outside of WorldTraveller!
 #include <stdlib.h>
 
-INTERNAL void updateBufferObject(Renderer *const renderer,
-                                 RenderQuad *const quads, const i32 numQuads)
-{
-	// TODO(doyle): We assume that vbo and vao are assigned
-	const i32 numVertexesInQuad = 4;
-	renderer->numVertexesInVbo = numQuads * numVertexesInQuad;
-
-	glBindBuffer(GL_ARRAY_BUFFER, renderer->vbo);
-	glBufferData(GL_ARRAY_BUFFER, numQuads * sizeof(RenderQuad), quads,
-	             GL_STREAM_DRAW);
-	glBindBuffer(GL_ARRAY_BUFFER, 0);
-}
-
 void worldTraveller_gameInit(GameState *state, v2i windowSize)
 {
 	AssetManager *assetManager = &state->assetManager;
@@ -143,7 +130,6 @@ void worldTraveller_gameInit(GameState *state, v2i windowSize)
 	shader_uniformSetMat4fv(renderer->shader, "projection", projection);
 	glCheckError();
 
-
 	/* Create buffers */
 	glGenVertexArrays(1, &renderer->vao);
 	glGenBuffers(1, &renderer->vbo);
@@ -165,6 +151,7 @@ void worldTraveller_gameInit(GameState *state, v2i windowSize)
 	glBindBuffer(GL_ARRAY_BUFFER, 0);
 	glBindVertexArray(0);
 	glCheckError();
+
 }
 
 INTERNAL void parseInput(GameState *state, const f32 dt)
@@ -308,106 +295,43 @@ void worldTraveller_gameUpdateAndRender(GameState *state, const f32 dt)
 	AssetManager *assetManager = &state->assetManager;
 	Renderer *renderer         = &state->renderer;
 
+	/* Render background tiles */
+#if 0
 	World *const world = &state->world[state->currWorldIndex];
 	TexAtlas *const worldAtlas =
 	    asset_getTextureAtlas(assetManager, world->texType);
 	Texture *const worldTex = asset_getTexture(assetManager, world->texType);
+	v2 tileSize = (CAST(f32)state->tileSize.w, CAST(f32)state->tileSize.h);
+	renderer_backgroundTiles(&state->renderer, tileSize, world, atlas, tex);
+#endif
 
-	f32 texNdcFactor = 1.0f / MAX_TEXTURE_SIZE;
+#ifdef WT_DEBUG
-
+	Entity *hero = &state->entityList[state->heroIndex];
-	RenderQuad worldQuads[ARRAY_COUNT(world->tiles)] = {0};
-	i32 quadIndex = 0;
-
-	/* Render background tiles */
-	const v2 tileSize = V2(CAST(f32) state->tileSize, CAST(f32) state->tileSize);
-	for (i32 i = 0; i < ARRAY_COUNT(world->tiles); i++)
-	{
-		Tile tile = world->tiles[i];
-		v2 tilePosInPixel = v2_scale(tile.pos, tileSize.x);
-
-		if ((tilePosInPixel.x < renderer->size.w && tilePosInPixel.x >= 0) &&
-		    (tilePosInPixel.y < renderer->size.h && tilePosInPixel.y >= 0))
-		{
-			const v4 texRect  = worldAtlas->texRect[terraincoords_ground];
-			const v4 tileRect = getRect(tilePosInPixel, tileSize);
-
-			RenderQuad tileQuad = renderer_createQuad(
-			    &state->renderer, tileRect, texRect, worldTex);
-			worldQuads[quadIndex++] = tileQuad;
-		}
-	}
-
-	updateBufferObject(renderer, worldQuads, quadIndex);
-	renderer_object(renderer, V2(0.0f, 0.0f), renderer->size, 0.0f,
-	                V3(0, 0, 0), worldTex);
-
 	Font *font = &assetManager->font;
-	char *string = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+	char textBuffer[256];
-	i32 strLen = 52;
+	snprintf(textBuffer, ARRAY_COUNT(textBuffer), "Hero Pos: %.2f,%.2f",
-	quadIndex = 0;
+	         hero->pos.x, hero->pos.y);
-	RenderQuad *stringQuads = CAST(RenderQuad *)calloc(strLen, sizeof(RenderQuad));
+	renderer_debugString(&state->renderer, font, textBuffer);
 
-	f32 baseline = 100.0f;
+	snprintf(textBuffer, ARRAY_COUNT(textBuffer), "Hero dPos: %.2f,%.2f",
-	f32 xPosOnScreen = 20.0f;
+	         hero->dPos.x, hero->dPos.y);
-	f32 yPosOnScreen = baseline;
+	renderer_debugString(&state->renderer, font, textBuffer);
-	for (i32 i = 0; i < strLen; i++)
-	{
-		// NOTE(doyle): Atlas packs fonts tightly, so offset the codepoint to
-		// its actual atlas index, i.e. we skip the first 31 glyphs
-		i32 codepoint = string[i];
-		i32 relativeIndex = codepoint - font->codepointRange.x;
-		CharMetrics charMetric = font->charMetrics[relativeIndex];
-		yPosOnScreen = baseline - charMetric.offset.y;
 
-		const v4 charRectOnScreen = getRect(
+	snprintf(textBuffer, ARRAY_COUNT(textBuffer), "FreeEntityIndex: %d",
-		    V2(xPosOnScreen, yPosOnScreen),
+	         state->freeEntityIndex);
-		    V2(CAST(f32) font->maxSize.w, CAST(f32) font->maxSize.h));
+	renderer_debugString(&state->renderer, font, textBuffer);
-
+#endif
-		xPosOnScreen += charMetric.advance;
-		
-		/* Get texture out */
-		v4 charTexRect = font->atlas->texRect[relativeIndex];
-		renderer_flipTexCoord(&charTexRect, FALSE, TRUE);
-
-		RenderQuad charQuad = renderer_createQuad(
-		    &state->renderer, charRectOnScreen, charTexRect, font->tex);
-		stringQuads[quadIndex++] = charQuad;
-	}
-
-	updateBufferObject(&state->renderer, stringQuads, quadIndex);
-	renderer_object(&state->renderer, V2(0.0f, 100.0f), renderer->size, 0.0f,
-	                V3(0, 0, 0), font->tex);
-	free(stringQuads);
 
 	/* Render entities */
 	ASSERT(state->freeEntityIndex < ARRAY_COUNT(state->entityList));
 	for (i32 i = 0; i < state->freeEntityIndex; i++)
 	{
 		Entity *const entity = &state->entityList[i];
-		SpriteAnim *anim = &entity->anim[entity->currAnimIndex];
+		renderer_entity(&state->renderer, entity, dt, 0.0f, V3(0, 0, 0));
-
-		v4 texRect = anim->rect[anim->currRectIndex];
-		anim->currDuration -= dt;
-		if (anim->currDuration <= 0.0f)
-		{
-			anim->currRectIndex++;
-			anim->currRectIndex = anim->currRectIndex % anim->numRects;
-			texRect             = anim->rect[anim->currRectIndex];
-			anim->currDuration  = anim->duration;
-		}
-
-		if (entity->direction == direction_east)
-		{
-			// NOTE(doyle): Flip the x coordinates to flip the tex
-			renderer_flipTexCoord(&texRect, TRUE, FALSE);
-		}
-
-		RenderQuad entityQuad =
-		    renderer_createDefaultQuad(&state->renderer, texRect, entity->tex);
-		updateBufferObject(&state->renderer, &entityQuad, 1);
-		renderer_entity(&state->renderer, entity, 0.0f, V3(0, 0, 0));
 	}
 
 	// TODO(doyle): Clean up lines
 	// Renderer::~Renderer() { glDeleteVertexArrays(1, &this->quadVAO); }
+
+	debugRenderer.init = FALSE;
 }

src/include/Dengine/AssetManager.h

@@ -90,4 +90,12 @@ const i32 asset_loadShaderFiles(AssetManager *assetManager,
                                 const enum ShaderList type);
 
 const i32 asset_loadTTFont(AssetManager *assetManager, const char *filePath);
+
+inline i32 asset_getVFontSpacing(FontMetrics metrics)
+{
+	i32 result =
+	    metrics.ascent - metrics.descent + metrics.lineGap;
+	return result;
+}
+
 #endif

src/include/Dengine/Common.h

@@ -26,5 +26,6 @@ typedef double f64;
 #define CAST(type) (type)
 #define ASSERT(expr) if(!(expr)) { *(int *)0 = 0; }
 
+i32 common_strlen(const char *const string);
 
 #endif

src/include/Dengine/Renderer.h

@@ -1,9 +1,8 @@
 #ifndef DENGINE_RENDERER_H
 #define DENGINE_RENDERER_H
 
-#include "Dengine/Math.h"
 #include "Dengine/Entity.h"
-#include "Dengine/Shader.h"
+#include "Dengine/AssetManager.h"
 
 typedef struct Renderer
 {
@@ -13,15 +12,35 @@ typedef struct Renderer
 	i32 numVertexesInVbo;
 	v2 vertexNdcFactor;
 	v2 size;
-
 } Renderer;
 
+typedef struct DebugRenderer
+{
+	b32 init;
+	v2 stringPos;
+
+} DebugRenderer;
+
 typedef struct RenderQuad
 {
 	v4 vertex[4];
 } RenderQuad;
 
-void renderer_entity(Renderer *renderer, Entity *entity, f32 rotate,
+extern DebugRenderer debugRenderer;
+
+#if 0
+void renderer_backgroundTiles(Renderer *const renderer, const v2 tileSize,
+                              World *const world, TexAtlas *const atlasTexture,
+                              Texture *const tex);
+#endif
+
+void renderer_string(Renderer *const renderer, Font *const font,
+                     const char *const string, v2 pos, f32 rotate, v3 color);
+
+void renderer_debugString(Renderer *const renderer, Font *const font,
+                          const char *const string);
+
+void renderer_entity(Renderer *renderer, Entity *entity, f32 dt, f32 rotate,
                      v3 color);
 
 void renderer_object(Renderer *renderer, v2 pos, v2 size, f32 rotate, v3 color,

src/include/WorldTraveller/WorldTraveller.h

@@ -45,6 +45,7 @@ typedef struct GameState
 	AssetManager assetManager;
 } GameState;
 
+
 void worldTraveller_gameInit(GameState *state, v2i windowSize);
 void worldTraveller_gameUpdateAndRender(GameState *state, const f32 dt);
 #endif