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split transform into modelview/projection

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This commit is contained in:
Josh Holtrop 2011-05-10 23:02:32 -04:00
parent 5adc26b089
commit 513599d855
2 changed files with 20 additions and 12 deletions
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25
lighting/test.cc
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@ -28,12 +28,14 @@ const GLushort indices[] = {
0, 1, 2, 3, 4, 5
};
GLuint program, vs, fs, data_vbo, index_vbo;
GLint ambient_loc, diffuse_loc, specular_loc, shininess_loc, transform_loc;
GLint ambient_loc, diffuse_loc, specular_loc, shininess_loc,
projection_loc, modelview_loc;
enum Locations {
LOC_POSITION,
LOC_NORMAL
};
static guMatrix4x4 transform;
static guMatrix4x4 projection;
static guMatrix4x4 modelview;
char * loadFile(const char *fname)
{
@ -133,14 +135,17 @@ bool init(int width, int height)
glClearColor (0.0, 0.0, 0.0, 0.0);
glEnable(GL_DEPTH_TEST);
glViewport(0, 0, WIDTH, HEIGHT);
guMatrixLoadIdentity(&transform);
guMatrixLoadIdentity(&projection);
guMatrixLoadIdentity(&modelview);
float near = 0.1;
float scale = near * 0.577 * 2;
float aspect = (float)width / (float)height;
guMatrixFrustum(&transform, -aspect * scale, aspect * scale, -scale, scale, near, 1000.0);
// guPerspective(&transform, 60, (float)width / (float)height, 0.1, 1000.0);
guMatrixTranslate(&transform, 0, 0, -1);
// guMatrixTranslate(&transform, 1, 0.3, 0);
guMatrixFrustum(&projection, -aspect * scale, aspect * scale, -scale, scale, near, 1000.0);
#if 0
guPerspective(&projection, 60, (float)width / (float)height, 0.1, 1000.0);
#endif
guMatrixTranslate(&modelview, 0, 0, -1);
// guMatrixTranslate(&modelview, 1, 0.3, 0);
vs = makeShader(GL_VERTEX_SHADER, "v_shader.glsl");
fs = makeShader(GL_FRAGMENT_SHADER, "f_shader.glsl");
@ -175,14 +180,16 @@ bool init(int width, int height)
diffuse_loc = glGetUniformLocation(program, "diffuse");
specular_loc = glGetUniformLocation(program, "specular");
shininess_loc = glGetUniformLocation(program, "shininess");
transform_loc = glGetUniformLocation(program, "transform");
projection_loc = glGetUniformLocation(program, "projection");
modelview_loc = glGetUniformLocation(program, "modelview");
glUseProgram(program);
glUniform4f(ambient_loc, 0.2, 0.2, 0.2, 1.0);
glUniform4f(diffuse_loc, 1.0, 0.6, 0.0, 1.0);
glUniform4f(specular_loc, 1.0, 1.0, 1.0, 1.0);
glUniform1f(shininess_loc, 85.0);
glUniformMatrix4fv(transform_loc, 1, GL_TRUE, &transform[0][0]);
glUniformMatrix4fv(projection_loc, 1, GL_TRUE, &projection[0][0]);
glUniformMatrix4fv(modelview_loc, 1, GL_TRUE, &modelview[0][0]);
data_vbo = makeBuffer(GL_ARRAY_BUFFER, data, sizeof(data));
index_vbo = makeBuffer(GL_ELEMENT_ARRAY_BUFFER, indices, sizeof(indices));

7
lighting/v_shader.glsl
View File

@ -1,5 +1,6 @@
uniform mat4 transform;
uniform mat4 projection;
uniform mat4 modelview;
attribute vec3 pos;
attribute vec3 normal;
@ -9,7 +10,7 @@ varying vec3 normal_i;
void main(void)
{
gl_Position = transform * vec4(pos, 1);
gl_Position = projection * modelview * vec4(pos, 1);
pos_i = vec3(gl_Position.x, gl_Position.y, gl_Position.z);
normal_i = vec3(transform * vec4(normal, 0.0));
normal_i = vec3(modelview * vec4(normal, 0.0));
}