Method updateTexture

examples/OpenGLWindow/GLInstancingRenderer.cpp:1083–1125

}

void GLInstancingRenderer::updateTexture(int textureIndex, const unsigned char* texels, bool flipPixelsY)
{
	B3_PROFILE("updateTexture");
	if ((textureIndex >= 0) && (textureIndex < m_data->m_textureHandles.size()))
	{
		glActiveTexture(GL_TEXTURE0);
		b3Assert(glGetError() == GL_NO_ERROR);
		InternalTextureHandle& h = m_data->m_textureHandles[textureIndex];
		glBindTexture(GL_TEXTURE_2D, h.m_glTexture);
		b3Assert(glGetError() == GL_NO_ERROR);

		if (flipPixelsY)
		{
			B3_PROFILE("flipPixelsY");
			//textures need to be flipped for OpenGL...
			b3AlignedObjectArray<unsigned char> flippedTexels;
			flippedTexels.resize(h.m_width * h.m_height * 3);

			for (int j = 0; j < h.m_height; j++)
			{
				for (int i = 0; i < h.m_width; i++)
				{
					flippedTexels[(i + j * h.m_width) * 3] = texels[(i + (h.m_height - 1 - j) * h.m_width) * 3];
					flippedTexels[(i + j * h.m_width) * 3 + 1] = texels[(i + (h.m_height - 1 - j) * h.m_width) * 3 + 1];
					flippedTexels[(i + j * h.m_width) * 3 + 2] = texels[(i + (h.m_height - 1 - j) * h.m_width) * 3 + 2];
				}
			}

			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, h.m_width, h.m_height, 0, GL_RGB, GL_UNSIGNED_BYTE, &flippedTexels[0]);
		}
		else
		{
			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, h.m_width, h.m_height, 0, GL_RGB, GL_UNSIGNED_BYTE, &texels[0]);
		}
		b3Assert(glGetError() == GL_NO_ERROR);
		if (h.m_enableFiltering)
		{
			B3_PROFILE("glGenerateMipmap");
			glGenerateMipmap(GL_TEXTURE_2D);
		}
		b3Assert(glGetError() == GL_NO_ERROR);
	}
}

void GLInstancingRenderer::activateTexture(int textureIndex)
{