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@@ -47,6 +47,8 @@ GLuint positionBuffer, colorBuffer, indexBuffer, texcoordBuffer, vertexArrayObje
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GLuint texture;
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GLuint vertBuffer2, indexBuffer2, texcoordBuffer2, vertexArrayObject2;
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GLuint texture2;
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///////////////////////////////////////////////////////////////////////////////
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@@ -119,6 +121,50 @@ void initialize()
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, labhelper::array_length(indices) * sizeof(float), indices,
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GL_STATIC_DRAW);
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///////////////////////////////////////////////////////////////////////////
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// Create the explosion quad
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///////////////////////////////////////////////////////////////////////////
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const float verts2[] = {
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128
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2.0f, 0.0f, -20.0f, // v0
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2.0f, 10.0f, -20.0f, // v1
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12.0f, 10.0f, -20.0f, // v2
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12.0f, 0.0f, -20.0f // v3
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};
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float texcoords2[] = {
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0.0f, 0.0f, // (u,v) for v0
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0.0f, 1.0f, // (u,v) for v1
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1.0f, 1.0f, // (u,v) for v2
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1.0f, 0.0f // (u,v) for v3
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};
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const int indices2[] = {
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0, 1, 3, // Triangle 1
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1, 2, 3 // Triangle 2
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};
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// Create the buffer objects
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glGenBuffers(1, &vertBuffer2);
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glBindBuffer(GL_ARRAY_BUFFER, vertBuffer2);
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glBufferData(GL_ARRAY_BUFFER, labhelper::array_length(verts2) * sizeof(float), verts2, GL_STATIC_DRAW);
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glGenBuffers(1, &texcoordBuffer2);
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glBindBuffer(GL_ARRAY_BUFFER, texcoordBuffer2);
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glBufferData(GL_ARRAY_BUFFER, labhelper::array_length(texcoords2) * sizeof(float), texcoords2,
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GL_STATIC_DRAW);
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glGenBuffers(1, &indexBuffer2);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer2);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, labhelper::array_length(indices2) * sizeof(float), indices2,
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GL_STATIC_DRAW);
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glGenVertexArrays(1, &vertexArrayObject2);
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glBindVertexArray(vertexArrayObject2);
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glBindBuffer(GL_ARRAY_BUFFER, vertBuffer2);
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glVertexAttribPointer(0, 3, GL_FLOAT, false /*normalized*/, 0 /*stride*/, 0 /*offset*/);
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glBindBuffer(GL_ARRAY_BUFFER, texcoordBuffer2);
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glVertexAttribPointer(2, 2, GL_FLOAT, false /*normalized*/, 0 /*stride*/, 0 /*offset*/);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer2);
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glEnableVertexAttribArray(0);
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glDisableVertexAttribArray(1);
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glEnableVertexAttribArray(2);
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// The loadShaderProgram and linkShaderProgam functions are defined in glutil.cpp and
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// do exactly what we did in lab1 but are hidden for convenience
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@@ -147,6 +193,22 @@ void initialize()
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glBindTexture(GL_TEXTURE_2D, 0);
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stbi_image_free(image);
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glGenTextures(1, &texture2);
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glBindTexture(GL_TEXTURE_2D, texture2);
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unsigned char* image2 = stbi_load("../scenes/textures/explosion.png", &w, &h, &comp, STBI_rgb_alpha);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image2);
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stbi_image_free(image2);
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//Indicates that the active texture should be repeated,
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//instead of for instance clamped, for texture coordinates > 1 or <-1.
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glGenerateMipmap(GL_TEXTURE_2D);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 16);
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// Sets the type of mipmap interpolation to be used on magnifying and
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// minifying the active texture. These are the nicest available options.
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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@@ -195,6 +257,12 @@ void display(void)
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glBindVertexArray(vertexArrayObject);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glBindTexture(GL_TEXTURE_2D, texture2);
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glBindVertexArray(vertexArrayObject2);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
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glDisable(GL_BLEND);
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glUseProgram(0); // "unsets" the current shader program. Not really necessary.
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}
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