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Fix memory leak in tutorial02.cpp #5

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Fix memory leak in tutorial02.cpp #5

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51 changes: 24 additions & 27 deletions tutorial02_red_triangle/tutorial02.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -7,55 +7,52 @@ int main(int argc, const char **argv)
{
InitGraphics();
printf("Screen started\n");

// Create and compile our GLSL program from the shaders
GLuint programID = LoadShaders( "simplevertshader.glsl", "simplefragshader.glsl" );
GLuint programID = LoadShaders("simplevertshader.glsl",
"simplefragshader.glsl");
printf("Shaders loaded\n");

GLfloat g_vertex_buffer_data[] = {
GLfloat g_vertex_buffer_data[] = {
-1.0f, -1.0f, 0.0f,
1.0f, -1.0f, 0.0f,
0.0f, 1.0f, 0.0f,
};

// Set the viewport
// glViewport ( 0, 0, GScreenWidth, GScreenHeight );
// Set the viewport
glViewport ( 0, 0, GScreenWidth, GScreenHeight );

do{
void* image = malloc(GScreenWidth * GScreenHeight * 4);

do {
// Clear the screen
glClear( GL_COLOR_BUFFER_BIT );

// Use our shader
glUseProgram(programID);

// 1rst attribute buffer : vertices
// glEnableVertexAttribArray(vertexPosition_modelspaceID);
// glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glVertexAttribPointer(
0, //vertexPosition_modelspaceID, // The attribute we want to configure
3, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
0, // stride
g_vertex_buffer_data // (void*)0 // array buffer offset
);
0, //vertexPosition_modelspaceID, // The attribute we want to configure
3, // size
GL_FLOAT, // type
GL_FALSE, // normalized?
0, // stride
g_vertex_buffer_data // (void*)0 // array buffer offset
);

// see above glEnableVertexAttribArray(vertexPosition_modelspaceID);
glEnableVertexAttribArray ( 0 );
// see above glEnableVertexAttribArray(vertexPosition_modelspaceID);
glEnableVertexAttribArray ( 0 );

// Draw the triangle !
glDrawArrays(GL_TRIANGLES, 0, 3); // 3 indices starting at 0 -> 1 triangle

uint32_t GScreenWidth = 1920;
uint32_t GScreenHeight = 1080;

void* image = malloc(GScreenWidth*GScreenHeight*4);
glBindFramebuffer(GL_FRAMEBUFFER,0);
glReadPixels(0,0,GScreenWidth,GScreenHeight, GL_RGBA, GL_UNSIGNED_BYTE, image); //GScreenWidth,GScreenHeight,
// 3 indices starting at 0 -> 1 triangle
glDrawArrays(GL_TRIANGLES, 0, 3);

updateScreen();
}
while(1);
glBindFramebuffer(GL_FRAMEBUFFER,0);
updateScreen();

glReadPixels(0, 0, GScreenWidth, GScreenHeight, GL_RGBA,
GL_UNSIGNED_BYTE, image);
} while(1);
}