Overlay::Overlay(GLuint *texIN,int wd,int ht,int x, int y)
{
tex=texIN;
m3dMakeOrthographicMatrix(screenspace,0.0f,800,0.0f,600,-1.0f,1.0f);
rect.Begin(GL_TRIANGLE_FAN,4,1);
rect.MultiTexCoord2f(0,0,ht);
rect.Vertex3f(x,y,0);
rect.MultiTexCoord2f(0,0,0);
rect.Vertex3f(x,y-ht,0);
rect.MultiTexCoord2f(0,wd,0);
rect.Vertex3f(x+wd,y-ht,0);
rect.MultiTexCoord2f(0,wd,ht);
rect.Vertex3f(x+wd,y,0);
rect.End();
myShader = gltLoadShaderPairWithAttributes("Shaders/overlay.vert", "Shaders/overlay.frag",
2, GLT_ATTRIBUTE_VERTEX, "vVertex", GLT_ATTRIBUTE_TEXTURE0, "vTexCoord");
locRectMVP = glGetUniformLocation(myShader, "mvpMatrix");
locRectTexture = glGetUniformLocation(myShader, "rectangleImage");
}
void Button::draw(GLfloat wWidth, GLfloat wHeight)
{
// Creating this matrix really doesn't need to be done every frame. I'll leave it here
// so all the pertenant code is together
M3DMatrix44f mScreenSpace;
m3dMakeOrthographicMatrix(mScreenSpace, 0.0f, wWidth, 0.0f, wHeight, -1.0f, 1.0f);
// Turn blending on, and depth testing off
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glUseProgram(rectReplaceShader);
glUniform1i(locRectTexture, 0);
glUniformMatrix4fv(locRectMVP, 1, GL_FALSE, mScreenSpace);
glBindTexture(GL_TEXTURE_RECTANGLE, uiTexture);
buttonBatch.Draw();
// Restore no blending and depth test
glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
}
void RenderScene(void)
{
static CStopWatch rotTimer;
float yRot = rotTimer.GetElapsedSeconds() * 60.0f;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
modelViewMatrix.PushMatrix();
M3DMatrix44f mCamera;
cameraFrame.GetCameraMatrix(mCamera);
modelViewMatrix.MultMatrix(mCamera);
modelViewMatrix.PushMatrix();
{
//反向
modelViewMatrix.Scale(1.0f, -1.0f, 1.0f);
//因为是反向，所以正数是向下
modelViewMatrix.Translate(0.0f, 0.8f, 0.0f); // Scootch the world down a bit...
//三维中其中一维反向之后，缠绕方向也会呈相反，所以重新定义缠绕正方向为顺时针方向；
glFrontFace(GL_CW);
DrawSongAndDance(yRot);
glFrontFace(GL_CCW);
}
modelViewMatrix.PopMatrix();
// Draw the solid ground
glEnable(GL_BLEND);
glBindTexture(GL_TEXTURE_2D, uiTextures[0]);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
static GLfloat vFloorColor[] = { 1.0f, 1.0f, 1.0f, 0.75f };
shaderManager.UseStockShader(GLT_SHADER_TEXTURE_MODULATE,
transformPipeLine.GetModelViewProjectionMatrix(),
vFloorColor,
0);
floorBatch.Draw();
glDisable(GL_BLEND);
DrawSongAndDance(yRot);
modelViewMatrix.PopMatrix();
// Render the overlay
// Creating this matrix really doesn't need to be done every frame. I'll leave it here
// so all the pertenant code is together
M3DMatrix44f mScreenSpace;
m3dMakeOrthographicMatrix(mScreenSpace, 0.0f, 800.0f, 0.0f, 600.0f, -1.0f, 1.0f);
// Turn blending on, and depth testing off
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glUseProgram(sphereWolrdShader);
glUniform1i(locTexture, 0);
glUniformMatrix4fv(locMVP, 1, GL_FALSE, mScreenSpace);
glBindTexture(GL_TEXTURE_RECTANGLE, uiTextures[3]);
logoBatch.Draw();
// Restore no blending and depth test
glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
// Do the buffer Swap
glutSwapBuffers();
// Do it again
glutPostRedisplay();
}
/**
* Called to draw scene
*/
void RenderScene(void)
{
static GLfloat vFloorColor[] = { 1.0f, 1.0f, 1.0f, 0.75f };
static CStopWatch rotTimer;
float yRot = rotTimer.delta() * 60.0f;
// Clear the window with current clearing color
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
modelViewMatrix.push();
M3DMatrix44f mCamera;
cameraFrame.GetCameraMatrix(mCamera);
modelViewMatrix.MultMatrix(mCamera);
// draw the world upside down
modelViewMatrix.push();
modelViewMatrix.scaleTo(1.0f, -1.0f, 1.0f); // flips the Y axis
modelViewMatrix.moveTo(0.0f, 0.8f, 0.0f); // scootch the world down a bit...
glFrontFace(GL_CW);
DrawSongAndDance(yRot);
glFrontFace(GL_CCW); // restore it
modelViewMatrix.pop();
// draw the solid ground
glEnable(GL_BLEND);
glBindTexture(GL_TEXTURE_2D, uiTextures[0]);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
shaderManager.useStockShader(GLT_SHADER_TEXTURE_MODULATE,
transformPipeline.GetMVPMatrix(),
vFloorColor,
0);
floorBatch.draw();
glDisable(GL_BLEND);
DrawSongAndDance(yRot);
modelViewMatrix.pop();
// Render the overlay
// Creating this matrix really doesn't need to be done every frame. I'll leave it here
// so all the pertenant code is together
M3DMatrix44f mScreenSpace;
m3dMakeOrthographicMatrix(mScreenSpace, 0.0f, 800.0f, 0.0f, 600.0f, -1.0f, 1.0f);
// turn blending on, and dephth testing off
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glUseProgram(rectReplaceShader);
glUniform1i(locRectTexture, 0);
glUniformMatrix4fv(locRectMVP, 1, GL_FALSE, mScreenSpace);
glBindTexture(GL_TEXTURE_RECTANGLE, uiTextures[3]);
logoBatch.draw();
// restore no blending and depth test
glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
// Perform the buffer swap to display back buffer
glutSwapBuffers();
glutPostRedisplay();
}
