// Setup lighting
void OpenGLShaderPass::setUpLightingCalculation(OpenGLState& current,
const RendererLight* light,
const Vector3& viewer,
const Matrix4& objTransform)
{
assert(light);
// Get the light shader and examine its first (and only valid) layer
MaterialPtr lightShader = light->getShader()->getMaterial();
if (lightShader->firstLayer() != 0)
{
// Calculate viewer location in object space
Matrix4 inverseObjTransform = objTransform.getInverse();
Vector3 osViewer = matrix4_transformed_point(
inverseObjTransform, viewer
);
// Get the XY and Z falloff texture numbers.
GLuint attenuation_xy =
lightShader->firstLayer()->getTexture()->getGLTexNum();
GLuint attenuation_z =
lightShader->lightFalloffImage()->getGLTexNum();
// Bind the falloff textures
assert(current.renderFlags & RENDER_TEXTURE_2D);
setTextureState(
current.texture3, attenuation_xy, GL_TEXTURE3, GL_TEXTURE_2D
);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
setTextureState(
current.texture4, attenuation_z, GL_TEXTURE4, GL_TEXTURE_2D
);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
// Get the world-space to light-space transformation matrix
Matrix4 world2light = light->getLightTextureTransformation();
// Set the ambient factor - 1.0 for an ambient light, 0.0 for normal light
float ambient = 0.0;
if (lightShader->isAmbientLight())
ambient = 1.0;
// Bind the GL program parameters
current.glProgram->applyRenderParams(
osViewer,
objTransform,
light->getLightOrigin(),
light->colour(),
world2light,
ambient
);
}
}
void MeshDrawCommand::commandSetRenderState(ShaderProgram *shader, Material *material, GLuint vertices, GLuint indices, bool withoutTexture)
{
if(shder != this->shaderProgream)
{
setShaderState();
}
if(!withoutTexture)
{
setTextureState();
}
if(vertices != this->vbo[0] || indices != this->vbo[1])
{
setAttribState();
}
}
// Apply all textures to texture units
void OpenGLShaderPass::applyAllTextures(OpenGLState& current,
unsigned requiredState)
{
// Set the texture dimensionality from render flags. There is only a global
// mode for all textures, we can't have texture1 as 2D and texture2 as
// CUBE_MAP for example.
GLenum textureMode = 0;
if (requiredState & RENDER_TEXTURE_CUBEMAP) // cube map has priority
textureMode = GL_TEXTURE_CUBE_MAP;
else if (requiredState & RENDER_TEXTURE_2D)
textureMode = GL_TEXTURE_2D;
// Apply our texture numbers to the current state
if (textureMode != 0) // only if one of the RENDER_TEXTURE options
{
if(GLEW_VERSION_1_3)
{
setTextureState(
current.texture0, _state.texture0, GL_TEXTURE0, textureMode
);
setTextureState(
current.texture1, _state.texture1, GL_TEXTURE1, textureMode
);
setTextureState(
current.texture2, _state.texture2, GL_TEXTURE2, textureMode
);
setTextureState(
current.texture3, _state.texture2, GL_TEXTURE2, textureMode
);
setTextureState(
current.texture4, _state.texture2, GL_TEXTURE2, textureMode
);
}
else
{
setTextureState(
current.texture0, _state.texture0, textureMode
);
}
}
}