void SetupBlurProg(void)
{
// Set the blur program as the current one
glUseProgram(blurProg);
// Set MVP matrix
glUniformMatrix4fv(glGetUniformLocation(blurProg, "mvpMatrix"), 1, GL_FALSE, transformPipeline.GetModelViewProjectionMatrix());
// Setup the textue units for the blur targets, these rotate every frame
glUniform1i(glGetUniformLocation(blurProg, "textureUnit0"), GetBlurTarget0());
glUniform1i(glGetUniformLocation(blurProg, "textureUnit1"), GetBlurTarget1());
glUniform1i(glGetUniformLocation(blurProg, "textureUnit2"), GetBlurTarget2());
glUniform1i(glGetUniformLocation(blurProg, "textureUnit3"), GetBlurTarget3());
glUniform1i(glGetUniformLocation(blurProg, "textureUnit4"), GetBlurTarget4());
glUniform1i(glGetUniformLocation(blurProg, "textureUnit5"), GetBlurTarget5());
}
void render(GLFWwindow* window, double time) {
static float tx = 0.0f;
static float dx = 2500.0f;
if (tx + dx*time > 3.5)
{
dx = -2500;
tx = 3.5 - (tx + dx*time - 3.5);
}
if (tx + dx*time < -3.5)
{
dx = 2500;
tx = -3.5 + (tx + dx*time + 3.5);
}
tx += time * dx;
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glVertexAttribPointer(
0, // attribute 0. No particular reason for 0, but must match the layout in the shader.
3, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
0, // stride
(void*)0 // array buffer offset
);
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, colorbuffer);
glVertexAttribPointer(
1, // attribute 1. No particular reason for 1, but must match the layout in the shader.
3, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
0, // stride
(void*)0 // array buffer offset
);
// Draw the triangle !
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUseProgram(programID);
// Projection matrix : 45° Field of View, 4:3 ratio, display range : 0.1 unit <-> 100 units
glm::mat4 Projection = glm::perspective(45.0f, 4.0f / 3.0f, 0.1f, 100.0f);
// Camera matrix
glm::mat4 View = glm::lookAt(
glm::vec3(4, 3, 3), // Camera is at (4,3,3), in World Space
glm::vec3(0, 0, 0), // and looks at the origin
glm::vec3(0, 1, 0) // Head is up (set to 0,-1,0 to look upside-down)
);
// Model matrix : an identity matrix (model will be at the origin)
glm::mat4 Model = glm::translate(tx, 0.0f, 0.0f); // Changes for each model !
// Our ModelViewProjection : multiplication of our 3 matrices
glm::mat4 MVP = Projection * View * Model; // Remember, matrix multiplication is the other way around
// Get a handle for our "MVP" uniform.
// Only at initialisation time.
GLuint MatrixID = glGetUniformLocation(programID, "MVP");
// Send our transformation to the currently bound shader,
// in the "MVP" uniform
// For each model you render, since the MVP will be different (at least the M part)
glUniformMatrix4fv(MatrixID, 1, GL_FALSE, &MVP[0][0]);
glDrawArrays(GL_TRIANGLES, 0, 12 * 3); // Starting from vertex 0; 3 vertices total -> 1 triangle
int width, height;
glfwGetWindowSize(window, &width, &height);
glBindBuffer(GL_PIXEL_PACK_BUFFER, pixelbuffer);
glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, NULL);
glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pixelbuffer);
glActiveTexture(GL_TEXTURE0 + GetBlurTarget0());
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glDisable(GL_DEPTH_TEST);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, texvertexbuffer);
glVertexAttribPointer(
0, // attribute 0. No particular reason for 0, but must match the layout in the shader.
3, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
0, // stride
(void*)0 // array buffer offset
);
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, texcoordbuffer);
glVertexAttribPointer(
1, // attribute 1. No particular reason for 1, but must match the layout in the shader.
2, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
0, // stride
(void*)0 // array buffer offset
);
glUseProgram(blurprogramID);
MVP = glm::mat4();
glUniformMatrix4fv(glGetUniformLocation(blurprogramID, "MVP"), 1, GL_FALSE, &MVP[0][0]);
// Setup the textue units for the blur targets, these rotate every frame
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit0"), GetBlurTarget0());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit1"), GetBlurTarget1());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit2"), GetBlurTarget2());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit3"), GetBlurTarget3());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit4"), GetBlurTarget4());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit5"), GetBlurTarget5());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit6"), GetBlurTarget6());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit7"), GetBlurTarget7());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit8"), GetBlurTarget8());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit9"), GetBlurTarget9());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit10"), GetBlurTarget10());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit11"), GetBlurTarget11());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit12"), GetBlurTarget12());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit13"), GetBlurTarget13());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit14"), GetBlurTarget14());
glUniform1i(glGetUniformLocation(blurprogramID, "textureUnit15"), GetBlurTarget15());
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
AdvanceBlurTaget();
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
}