Graphics Reference
In-Depth Information
Example 8-9
OpenGL ES 1.1 Fixed-Function Vertex Pipeline
(continued)
uniform bool xform_eye_p; // xform_eye_p is set if we need
// Peye for user clip plane,
// lighting, or fog
uniform bool rescale_normal; // is rescale normal enabled
uniform bool normalize_normal; // is normalize normal
// enabled
uniform float rescale_normal_factor; // rescale normal
// factor if
// glEnable(GL_RESCALE_NORMAL)
uniform vec4 ucp_eqn; // user clip plane equation;
// one user clip plane specified
uniform bool enable_ucp; // is user clip plane enabled
//******************************************************
// vertex attributes: not all of them may be passed in
//******************************************************
in vec4 a_position; // this attribute is always specified
in vec4 a_texcoord0; // available if enable_tex[0] is true
in vec4 a_texcoordl; // available if enable_tex[1] is true
in vec4 a_color; // available if !enable_lighting or
// (enable_lighting && enable_color_material)
in vec3 a_normal; // available if xform_normal is set
// (required for lighting)
//************************************************
// output variables of the vertex shader
//************************************************
out vec4 v_texcoord[NUM_TEXTURES];
out vec4 v_front_color;
out vec4 v_back_color;
out float v_fog_factor;
out float v_ucp_factor;
//************************************************
// temporary variables used by the vertex shader
//************************************************
vec4 p_eye;
vec3 n;
vec4 mat_ambient_color;
vec4 mat_diffuse_color;
