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Merge pull request #73 from victorfisac/develop

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World to screen conversion and little review
This commit is contained in:
Ray 2016-01-11 19:47:17 +01:00
commit bb49102a4b
3 changed files with 108 additions and 22 deletions
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77
examples/core_world_screen.c Normal file
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@ -0,0 +1,77 @@
/*******************************************************************************************
*
* raylib [core] example - World to screen
*
* This example has been created using raylib 1.3 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Copyright (c) 2015 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
int main()
{
// Initialization
//--------------------------------------------------------------------------------------
int screenWidth = 800;
int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [core] example - 3d camera free");
// Define the camera to look into our 3d world
Camera camera = {{ 0.0, 10.0, 10.0 }, { 0.0, 0.0, 0.0 }, { 0.0, 1.0, 0.0 }};
Vector3 cubePosition = { 0.0, 0.0, 0.0 };
Vector2 cubeScreenPosition;
SetCameraMode(CAMERA_FREE); // Set a free camera mode
SetCameraPosition(camera.position); // Set internal camera position to match our camera position
SetCameraTarget(camera.target); // Set internal camera target to match our camera target
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
UpdateCamera(&camera); // Update internal camera and our camera
// Calculate cube screen space position (with a little offset to be in top)
cubeScreenPosition = WorldToScreen((Vector3){cubePosition.x, cubePosition.y + 2.5f, cubePosition.z}, camera);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
Begin3dMode(camera);
DrawCube(cubePosition, 2, 2, 2, RED);
DrawCubeWires(cubePosition, 2, 2, 2, MAROON);
DrawGrid(10.0, 1.0);
End3dMode();
DrawText("Enemy: 100 / 100", cubeScreenPosition.x - MeasureText("Enemy: 100 / 100", 20) / 2, cubeScreenPosition.y, 20, BLACK);
DrawText("Text is always on top of the cube", (screenWidth - MeasureText("Text is always on top of the cube", 20)) / 2, 25, 20, GRAY);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}

30
src/core.c
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@ -791,7 +791,7 @@ int StorageLoadValue(int position)
return value;
}
// Gives the ray trace from mouse position
// Returns a ray trace from mouse position
//http://www.songho.ca/opengl/gl_transform.html
//http://www.songho.ca/opengl/gl_matrix.html
//http://www.sjbaker.org/steve/omniv/matrices_can_be_your_friends.html
@ -857,6 +857,34 @@ Ray GetMouseRay(Vector2 mousePosition, Camera camera)
return ray;
}
// Returns the screen space position from a 3d world space position
Vector2 WorldToScreen(Vector3 position, Camera camera)
{
// Calculate projection matrix (from perspective instead of frustum
Matrix matProj = MatrixPerspective(45.0f, (float)((float)GetScreenWidth() / (float)GetScreenHeight()), 0.01f, 1000.0f);
// Calculate view matrix from camera look at (and transpose it)
Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up);
MatrixTranspose(&matView);
// Convert world position vector to quaternion
Quaternion worldPos = { position.x, position.y, position.z, 1.0f };
// Transform world position to view
QuaternionTransform(&worldPos, matView);
// Transform result to projection (clip space position)
QuaternionTransform(&worldPos, matProj);
// Calculate normalized device coordinates (inverted y)
Vector3 ndcPos = { worldPos.x / worldPos.w, -worldPos.y / worldPos.w, worldPos.z / worldPos.z };
// Calculate 2d screen position vector
Vector2 screenPosition = { (ndcPos.x + 1.0f) / 2.0f * GetScreenWidth(), (ndcPos.y + 1.0f) / 2.0f * GetScreenHeight() };
return screenPosition;
}
//----------------------------------------------------------------------------------
// Module Functions Definition - Input (Keyboard, Mouse, Gamepad) Functions
//----------------------------------------------------------------------------------

23
src/raylib.h
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@ -527,7 +527,8 @@ void EndDrawing(void); // End canvas drawin
void Begin3dMode(Camera cam); // Initializes 3D mode for drawing (Camera setup)
void End3dMode(void); // Ends 3D mode and returns to default 2D orthographic mode
Ray GetMouseRay(Vector2 mousePosition, Camera camera); // TODO: Returns a ray trace from mouse position
Ray GetMouseRay(Vector2 mousePosition, Camera camera); // Returns a ray trace from mouse position
Vector2 WorldToScreen(Vector3 position, Camera camera); // Returns the screen space position from a 3d world space position
void SetTargetFPS(int fps); // Set target FPS (maximum)
float GetFPS(void); // Returns current FPS
@ -786,26 +787,6 @@ void SetShaderMap(Shader *shader, int mapLocation, Texture2D texture, int textur
void SetBlendMode(int mode); // Set blending mode (alpha, additive, multiplied)
//----------------------------------------------------------------------------------
// Lighting System Functions (engine-module: lighting)
// NOTE: light and material structs uses float pointers instead of vectors to be compatible with SetShaderValue()
//----------------------------------------------------------------------------------
// Lights functions
void SetLightPosition(Light *light, Vector3 position); // Set light position converting position vector to float pointer
void SetLightRotation(Light *light, Vector3 rotation); // Set light rotation converting rotation vector to float pointer
void SetLightIntensity(Light *light, float intensity); // Set light intensity value
void SetLightAmbientColor(Light *light, Vector3 color); // Set light ambient color value (it will be multiplied by material ambient color)
void SetLightDiffuseColor(Light *light, Vector3 color); // Set light diffuse color (light color)
void SetLightSpecularColor(Light *light, Vector3 color); // Set light specular color (it will be multiplied by material specular color)
void SetLightSpecIntensity(Light *light, float specIntensity); // Set light specular intensity (specular color scalar multiplier)
// Materials functions
void SetMaterialAmbientColor(Material *material, Vector3 color); // Set material ambient color value (it will be multiplied by light ambient color)
void SetMaterialDiffuseColor(Material *material, Vector3 color); // Set material diffuse color (material color, should use DrawModel() tint parameter)
void SetMaterialSpecularColor(Material *material, Vector3 color); // Set material specular color (it will be multiplied by light specular color)
void SetMaterialGlossiness(Material *material, float glossiness); // Set material glossiness value (recommended values: 0 - 100)
void SetMaterialNormalDepth(Material *material, float depth); // Set normal map depth (B component from RGB type map scalar multiplier)
//----------------------------------------------------------------------------------
// Physics System Functions (engine-module: physics)
//----------------------------------------------------------------------------------