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Renderer calculates NDC coordinates from screen coords

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This commit is contained in:
Doyle Thai
2016-06-29 20:44:35 +10:00
parent fa83daac60
commit d8ee46611f
7 changed files with 108 additions and 111 deletions
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src/WorldTraveller.c
+35 -58
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@@ -19,7 +19,7 @@ INTERNAL void updateBufferObject(Renderer *const renderer,
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
void worldTraveller_gameInit(GameState *state)
void worldTraveller_gameInit(GameState *state, v2i windowSize)
{
AssetManager *assetManager = &state->assetManager;
/* Initialise assets */
@@ -131,14 +131,19 @@ void worldTraveller_gameInit(GameState *state)
/* Init renderer */
Renderer *renderer = &state->renderer;
renderer->size = V2(CAST(f32)windowSize.x, CAST(f32)windowSize.y);
// NOTE(doyle): Value to map a screen coordinate to NDC coordinate
renderer->vertexNdcFactor =
V2(1.0f / renderer->size.w, 1.0f / renderer->size.h);
renderer->shader = asset_getShader(assetManager, shaderlist_sprite);
shader_use(renderer->shader);
const mat4 projection = mat4_ortho(0.0f, CAST(f32) state->width, 0.0f,
CAST(f32) state->height, 0.0f, 1.0f);
const mat4 projection =
mat4_ortho(0.0f, renderer->size.w, 0.0f, renderer->size.h, 0.0f, 1.0f);
shader_uniformSetMat4fv(renderer->shader, "projection", projection);
glCheckError();
/* Create buffers */
glGenVertexArrays(1, &renderer->vao);
glGenBuffers(1, &renderer->vbo);
@@ -301,8 +306,9 @@ void worldTraveller_gameUpdateAndRender(GameState *state, const f32 dt)
glCheckError();
AssetManager *assetManager = &state->assetManager;
Renderer *renderer = &state->renderer;
World *const world = &state->world[state->currWorldIndex];
World *const world = &state->world[state->currWorldIndex];
TexAtlas *const worldAtlas =
asset_getTextureAtlas(assetManager, world->texType);
Texture *const worldTex = asset_getTexture(assetManager, world->texType);
@@ -312,119 +318,90 @@ void worldTraveller_gameUpdateAndRender(GameState *state, const f32 dt)
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);
const v2 vertexNdcFactor = V2(1.0f / state->width, 1.0f / state->height);
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 < state->width && tilePosInPixel.x >= 0) &&
(tilePosInPixel.y < state->height && tilePosInPixel.y >= 0))
if ((tilePosInPixel.x < renderer->size.w && tilePosInPixel.x >= 0) &&
(tilePosInPixel.y < renderer->size.h && tilePosInPixel.y >= 0))
{
const v4 tileTexRect = worldAtlas->texRect[terraincoords_ground];
const v4 texRectNdc = v4_scale(tileTexRect, texNdcFactor);
const v4 texRect = worldAtlas->texRect[terraincoords_ground];
const v4 tileRect = getRect(tilePosInPixel, tileSize);
v4 tileRectNdc = tileRect;
tileRectNdc.e[0] *= vertexNdcFactor.w;
tileRectNdc.e[1] *= vertexNdcFactor.h;
tileRectNdc.e[2] *= vertexNdcFactor.w;
tileRectNdc.e[3] *= vertexNdcFactor.h;
RenderQuad tileQuad = renderer_createQuad(tileRectNdc, texRectNdc);
RenderQuad tileQuad = renderer_createQuad(
&state->renderer, tileRect, texRect, worldTex);
worldQuads[quadIndex++] = tileQuad;
}
}
const v2 screenSize = V2(CAST(f32)state->width, CAST(f32)state->height);
updateBufferObject(&state->renderer, worldQuads, quadIndex);
renderer_object(&state->renderer, V2(0.0f, 0.0f), screenSize, 0.0f,
updateBufferObject(renderer, worldQuads, quadIndex);
renderer_object(renderer, V2(0.0f, 0.0f), renderer->size, 0.0f,
V3(0, 0, 0), worldTex);
/* Render font sheet */
Texture *font = asset_getTexture(assetManager, texlist_font);
v4 fontTexRect = V4(0.0f, 1.0f, 1.0f, 0.0);
RenderQuad fontQuad = renderer_createDefaultQuad(fontTexRect);
updateBufferObject(&state->renderer, &fontQuad, 1);
renderer_object(&state->renderer, V2(300.0f, -300.0f),
V2(CAST(f32)font->width, CAST(f32)font->height), 0.0f,
V3(0, 0, 0), font);
Font *font = &assetManager->font;
char *string = "hello world";
i32 strLen = 11;
quadIndex = 0;
RenderQuad *stringQuads = CAST(RenderQuad *)calloc(strLen, sizeof(RenderQuad));
TexAtlas *fontAtlas = asset_getTextureAtlas(assetManager, texlist_font);
v2 eachCharSize = getRectSize(fontAtlas->texRect[0]);
f32 xPosOnScreen = 20.0f;
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 atlasIndex = string[i] - assetManager->codepointRange.x;
i32 atlasIndex = string[i] - font->codepointRange.x;
const v4 charTexRect = fontAtlas->texRect[atlasIndex];
v4 charTexRectNdc = v4_scale(charTexRect, texNdcFactor);
renderer_flipTexCoord(&charTexRectNdc, FALSE, TRUE);
v4 charTexRect = font->atlas->texRect[atlasIndex];
renderer_flipTexCoord(&charTexRect, FALSE, TRUE);
const v4 charRectOnScreen =
getRect(V2(xPosOnScreen, 100.0f), eachCharSize);
xPosOnScreen += eachCharSize.w;
v4 charRectOnScreenNdc = charRectOnScreen;
getRect(V2(xPosOnScreen, 100.0f),
V2(CAST(f32) font->charSize.w, CAST(f32) font->charSize.w));
xPosOnScreen += font->charSize.w;
charRectOnScreenNdc.e[0] *= vertexNdcFactor.w;
charRectOnScreenNdc.e[1] *= vertexNdcFactor.h;
charRectOnScreenNdc.e[2] *= vertexNdcFactor.w;
charRectOnScreenNdc.e[3] *= vertexNdcFactor.h;
RenderQuad charQuad =
renderer_createQuad(charRectOnScreenNdc, charTexRectNdc);
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), screenSize, 0.0f,
V3(0, 0, 0), font);
renderer_object(&state->renderer, V2(0.0f, 100.0f), renderer->size, 0.0f,
V3(0, 0, 0), font->tex);
free(stringQuads);
/* Render entities */
// NOTE(doyle): Factor to normalise sprite sheet rect coords to -1, 1
Entity *const hero = &state->entityList[state->heroIndex];
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];
v4 currFrameRect = anim->rect[anim->currRectIndex];
v4 texRect = anim->rect[anim->currRectIndex];
anim->currDuration -= dt;
if (anim->currDuration <= 0.0f)
{
anim->currRectIndex++;
anim->currRectIndex = anim->currRectIndex % anim->numRects;
currFrameRect = anim->rect[anim->currRectIndex];
texRect = anim->rect[anim->currRectIndex];
anim->currDuration = anim->duration;
}
v4 texRectNdc = v4_scale(currFrameRect, texNdcFactor);
if (entity->direction == direction_east)
{
// NOTE(doyle): Flip the x coordinates to flip the tex
renderer_flipTexCoord(&texRectNdc, TRUE, FALSE);
renderer_flipTexCoord(&texRect, TRUE, FALSE);
}
RenderQuad quad = renderer_createDefaultQuad(texRectNdc);
updateBufferObject(&state->renderer, &quad, 1);
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); }
}