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@@ -178,6 +178,26 @@ void initFullScreenQuad()
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{
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// Task 4.1
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// ...
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static const glm::vec2 positions[] = { { -1.0f, -1.0f }, { 1.0f, -1.0f }, { 1.0f, 1.0f },
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{ -1.0f, -1.0f }, { 1.0f, 1.0f }, { -1.0f, 1.0f } };
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GLuint positionBuffer;
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glGenBuffers(1, &positionBuffer);
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// Set the newly created buffer as the current one
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glBindBuffer(GL_ARRAY_BUFFER, positionBuffer);
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// Send the vertex position data to the current buffer
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glBufferData(GL_ARRAY_BUFFER, labhelper::array_length(positions) * sizeof(glm::vec2), positions,
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GL_STATIC_DRAW);
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glGenVertexArrays(1, &fullScreenQuadVAO);
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// Bind the vertex array object
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// The following calls will affect this vertex array object.
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glBindVertexArray(fullScreenQuadVAO);
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// Makes positionBuffer the current array buffer for subsequent calls.
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glBindBuffer(GL_ARRAY_BUFFER, positionBuffer);
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// Attaches positionBuffer to fullScreenQuadVAO, in the 0th attribute location
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glVertexAttribPointer(0, 2, GL_FLOAT, false /*normalized*/, 0 /*stride*/, 0 /*offset*/);
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// Enable the vertex position attribute
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glEnableVertexAttribArray(0);
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}
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}
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@@ -191,6 +211,13 @@ void drawFullScreenQuad()
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///////////////////////////////////////////////////////////////////////////
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// Task 4.2
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// ...
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GLboolean previous_depth_state;
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glGetBooleanv(GL_DEPTH_TEST, &previous_depth_state);
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glDisable(GL_DEPTH_TEST);
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glBindVertexArray(fullScreenQuadVAO);
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glDrawArrays(GL_TRIANGLES, 0, 6);
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if(previous_depth_state)
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glEnable(GL_DEPTH_TEST);
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}
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@@ -350,6 +377,11 @@ void display(void)
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// Task 4.3 - Render a fullscreen quad, to generate the background from the
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// environment map.
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///////////////////////////////////////////////////////////////////////////
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glUseProgram(backgroundProgram);
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labhelper::setUniformSlow(backgroundProgram, "environment_multiplier", environment_multiplier);
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382
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labhelper::setUniformSlow(backgroundProgram, "inv_PV", inverse(projectionMatrix * viewMatrix));
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383
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labhelper::setUniformSlow(backgroundProgram, "camera_pos", camera.position);
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drawFullScreenQuad();
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///////////////////////////////////////////////////////////////////////////
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// Render the .obj models
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