int index = 0;
float srcX = 16.0 / 256.0;
float srcY = 0;
float srcW = 16.0 / 256.0;
float srcH = 16.0 / 256.0;
for(int y = 0; y < 14; y++) {
for(int x = 0; x < 18; x++) {
verts[index].x = x * 32;
verts[index].y = y * 32;
verts[index].tx = srcX;
verts[index].ty = srcY;
index++;
verts[index].x = (x * 32) + 32;
verts[index].y = y * 32;
verts[index].tx = srcX + srcW;
verts[index].ty = srcY;
index++;
verts[index].x = (x * 32) + 32;
verts[index].y = (y * 32) + 32;
verts[index].tx = srcX + srcW;
verts[index].ty = srcY + srcH;
index++;
verts[index].x = x * 32;
verts[index].y = (y * 32) + 32;
verts[index].tx = srcX;
verts[index].ty = srcY + srcH;
index++;
}
}
Something funky with my map loop?
Author
So something funky is happening with my tile map loop. When I increase the number of tiles wide the map is, the height shrinks, and I can't figure out why. Shouldn't it work just like the loop describes? For each row, generate the row of tiles across. For example, if I set the number of y tiles to 24 and x tiles to 20, the map does not grow by that many tiles...it almost stays the same size except for one new row.
Need more code; in particular, where verts[] and its structure is declared, and where verts[] is iterated over.
Those loops look OK.
Are you increasing the size of verts (to width * height * 4) when you increase the map dimensions too?
Are you increasing the size of verts (to width * height * 4) when you increase the map dimensions too?
Author
yea I set the array to be 2000, should be enough for a 20x20 map.
struct Vertex { float x, y; float tx, ty;};void Graphics::drawMapLayer(Texture *texture) { Vertex *verts = new Vertex[2000]; int index = 0; float srcX = 16.0 / 256.0; float srcY = 0; float srcW = 16.0 / 256.0; float srcH = 16.0 / 256.0; for(int y = 0; y < 20; y++) { for(int x = 0; x < 20; x++) { verts[index].x = x * 32; verts[index].y = y * 32; verts[index].tx = srcX; verts[index].ty = srcY; index++; verts[index].x = (x * 32) + 32; verts[index].y = y * 32; verts[index].tx = srcX + srcW; verts[index].ty = srcY; index++; verts[index].x = (x * 32) + 32; verts[index].y = (y * 32) + 32; verts[index].tx = srcX + srcW; verts[index].ty = srcY + srcH; index++; verts[index].x = x * 32; verts[index].y = (y * 32) + 32; verts[index].tx = srcX; verts[index].ty = srcY + srcH; index++; } } glLoadIdentity(); glBindBufferARB(GL_ARRAY_BUFFER_ARB, _vbo); glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(Vertex) * 2000, &verts[0].x, GL_STATIC_DRAW_ARB); delete verts; glColor4f(1.0, 1.0, 1.0, 1.0); glBindTexture(GL_TEXTURE_2D, texture->getTexture()); glBindBufferARB(GL_ARRAY_BUFFER_ARB, _vbo); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glVertexPointer(2, GL_FLOAT, sizeof(Vertex), 0); glTexCoordPointer(2, GL_FLOAT, sizeof(Vertex), BUFFER_OFFSET(8)); glDrawArrays(GL_QUADS, 0, 1140); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glDisableClientState(GL_VERTEX_ARRAY); glBindBufferARB(GL_ARRAY_BUFFER,0);}
You need to pass the increased amount of vertices to glDrawArrays. You are currently using a constant value of 1140, it should be width * height * 4.
Just to clarify, unhardcoding things like the tile and map dimensions would be a good idea.
const int mapWidth = 20, mapHeight = 20;const int tileWidth = 32, tileHeight = 32;struct Vertex { float x, y; float tx, ty;};void Graphics::drawMapLayer(Texture *texture) { const int numVertices = mapWidth * mapHeight * 4; Vertex *verts = new Vertex[numVertices]; int index = 0; float srcX = 16.0 / 256.0; float srcY = 0; float srcW = 16.0 / 256.0; float srcH = 16.0 / 256.0; for(int y = 0; y < mapHeight; y++) { for(int x = 0; x < mapWidth; x++) { verts[index].x = x * tileWidth; verts[index].y = y * tileHeight; verts[index].tx = srcX; verts[index].ty = srcY; index++; verts[index].x = (x + 1) * tileWidth; verts[index].y = y * tileHeight; verts[index].tx = srcX + srcW; verts[index].ty = srcY; index++; verts[index].x = (x + 1) * tileWidth; verts[index].y = (y + 1) * tileHeight; verts[index].tx = srcX + srcW; verts[index].ty = srcY + srcH; index++; verts[index].x = x * tileWidth; verts[index].y = (y + 1) * tileHeight; verts[index].tx = srcX; verts[index].ty = srcY + srcH; index++; } } glLoadIdentity(); glBindBufferARB(GL_ARRAY_BUFFER_ARB, _vbo); glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(Vertex) * numVertices, &verts[0].x, GL_STATIC_DRAW_ARB); delete verts; glColor4f(1.0, 1.0, 1.0, 1.0); glBindTexture(GL_TEXTURE_2D, texture->getTexture()); glBindBufferARB(GL_ARRAY_BUFFER_ARB, _vbo); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glVertexPointer(2, GL_FLOAT, sizeof(Vertex), 0); glTexCoordPointer(2, GL_FLOAT, sizeof(Vertex), BUFFER_OFFSET(8)); glDrawArrays(GL_QUADS, 0, numVertices); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glDisableClientState(GL_VERTEX_ARRAY); glBindBufferARB(GL_ARRAY_BUFFER,0);}This topic is closed to new replies.
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