Difference between revisions of "Example/Uniform Location Query Old"
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(Categorization.) |
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| Line 7: | Line 7: | ||
uniform mat4 someMatrix; | uniform mat4 someMatrix; | ||
... | ... | ||
| − | //Code must use these uniforms to be active. | + | // Code must use these uniforms to be active. |
</source> | </source> | ||
C++ code: | C++ code: | ||
<source lang=cpp> | <source lang=cpp> | ||
| − | GLuint program = //Compile and link program. | + | GLuint program = // Compile and link program. |
GLint someVectorLoc = glGetUniformLocation(program, "someVector"); | GLint someVectorLoc = glGetUniformLocation(program, "someVector"); | ||
| − | assert(someVectorLoc != -1); //If fails, then the uniform is inactive. | + | assert(someVectorLoc != -1); // If fails, then the uniform is inactive. |
GLint someMatrixLoc = glGetUniformLocation(program, "someMatrix"); | GLint someMatrixLoc = glGetUniformLocation(program, "someMatrix"); | ||
| − | assert(someMatrixLoc != -1); //If fails, then the uniform is inactive. | + | assert(someMatrixLoc != -1); // If fails, then the uniform is inactive. |
... | ... | ||
glUseProgram(program); | glUseProgram(program); | ||
glUniform3f(someVectorLoc, 3.0f, 3.0f, 4.0f); | glUniform3f(someVectorLoc, 3.0f, 3.0f, 4.0f); | ||
GLfloat matrix[16]; | GLfloat matrix[16]; | ||
| − | //Fill `matrix` with data. Non-transposed matrix data. | + | // Fill `matrix` with data. Non-transposed matrix data. |
glUniformMatrix4fv(someMatrixLoc, 1, GL_FALSE, matrix); | glUniformMatrix4fv(someMatrixLoc, 1, GL_FALSE, matrix); | ||
</source> | </source> | ||
<noinclude>[[Category:Example Code]]</noinclude> | <noinclude>[[Category:Example Code]]</noinclude> | ||
Latest revision as of 11:16, 3 January 2018
Querying and using uniform locations, under the old introspection API.
Vertex shader code:
...
uniform vec3 someVector;
uniform mat4 someMatrix;
...
// Code must use these uniforms to be active.C++ code:
GLuint program = // Compile and link program.
GLint someVectorLoc = glGetUniformLocation(program, "someVector");
assert(someVectorLoc != -1); // If fails, then the uniform is inactive.
GLint someMatrixLoc = glGetUniformLocation(program, "someMatrix");
assert(someMatrixLoc != -1); // If fails, then the uniform is inactive.
...
glUseProgram(program);
glUniform3f(someVectorLoc, 3.0f, 3.0f, 4.0f);
GLfloat matrix[16];
// Fill `matrix` with data. Non-transposed matrix data.
glUniformMatrix4fv(someMatrixLoc, 1, GL_FALSE, matrix);