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-rw-r--r--src/models.c189
1 files changed, 158 insertions, 31 deletions
diff --git a/src/models.c b/src/models.c
index 9edfb142..e21ff894 100644
--- a/src/models.c
+++ b/src/models.c
@@ -39,7 +39,14 @@
//----------------------------------------------------------------------------------
// Types and Structures Definition
//----------------------------------------------------------------------------------
-// ...
+
+// Matrix type (OpenGL style 4x4 - right handed)
+typedef struct Matrix {
+ float m0, m4, m8, m12;
+ float m1, m5, m9, m13;
+ float m2, m6, m10, m14;
+ float m3, m7, m11, m15;
+} Matrix;
//----------------------------------------------------------------------------------
// Global Variables Definition
@@ -50,13 +57,15 @@
// Module specific Functions Declaration
//----------------------------------------------------------------------------------
static float GetHeightValue(Color pixel);
+static void MatrixTranspose(Matrix *mat);
+static Matrix MatrixLookAt(Vector3 eye, Vector3 target, Vector3 up);
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
// Draw cube
-// NOTE: Cube position is de center position
+// NOTE: Cube position is the center position
void DrawCube(Vector3 position, float width, float height, float lenght, Color color)
{
glPushMatrix();
@@ -664,7 +673,7 @@ Model LoadHeightmap(Image heightmap, float maxHeight)
Model model;
int mapX = heightmap.width;
- int mapZ = heightmap.height;
+ int mapZ = heightmap.height;
// NOTE: One vertex per pixel
// TODO: Consider resolution when generating model data?
@@ -681,11 +690,11 @@ Model LoadHeightmap(Image heightmap, float maxHeight)
float scaleFactor = maxHeight/255; // TODO: Review scaleFactor calculation
- for(int z = 0; z < mapZ-1; z++)
- {
- for(int x = 0; x < mapX-1; x++)
- {
- // Fill vertices array with data
+ for(int z = 0; z < mapZ-1; z++)
+ {
+ for(int x = 0; x < mapX-1; x++)
+ {
+ // Fill vertices array with data
//----------------------------------------------------------
// one triangle - 3 vertex
@@ -738,8 +747,8 @@ Model LoadHeightmap(Image heightmap, float maxHeight)
vCounter += 6;
trisCounter += 2;
- }
- }
+ }
+ }
return model;
}
@@ -805,47 +814,165 @@ void DrawModelWires(Model model, Vector3 position, float scale, Color color)
}
// Draw a billboard
-void DrawBillboard(Camera camera, Texture2D texture, Vector3 basePos, float size, Color tint)
+void DrawBillboard(Camera camera, Texture2D texture, Vector3 center, float size, Color tint)
{
- // NOTE: Billboard size will represent the width, height maintains aspect ratio
- Vector3 centerPos = { basePos.x, basePos.y + size * (float)texture.height/(float)texture.width/2, basePos.z };
+ // NOTE: Billboard size will maintain texture aspect ratio, size will be billboard width
Vector2 sizeRatio = { size, size * (float)texture.height/texture.width };
- Vector3 rotation = { 90, 0, 0 };
- // TODO: Calculate Y rotation to face always camera (use matrix)
- // OPTION: Lock Y-axis
-
+ Matrix viewMatrix = MatrixLookAt(camera.position, camera.target, camera.up);
+ MatrixTranspose(&viewMatrix);
+
+ Vector3 right = { viewMatrix.m0, viewMatrix.m4, viewMatrix.m8 };
+ Vector3 up = { viewMatrix.m1, viewMatrix.m5, viewMatrix.m9 };
+/*
+ d-------c
+ | |
+ | * |
+ | |
+ a-------b
+*/
+ VectorScale(&right, sizeRatio.x/2);
+ VectorScale(&up, sizeRatio.y/2);
+
+ Vector3 p1 = VectorAdd(right, up);
+ Vector3 p2 = VectorSubtract(right, up);
+
+ Vector3 a = VectorSubtract(center, p2);
+ Vector3 b = VectorAdd(center, p1);
+ Vector3 c = VectorAdd(center, p2);
+ Vector3 d = VectorSubtract(center, p1);
+
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture.glId);
-
- DrawPlane(centerPos, sizeRatio, rotation, tint); // TODO: Review this function...
+
+ glBegin(GL_QUADS);
+ glColor4ub(tint.r, tint.g, tint.b, tint.a);
+ glNormal3f(0.0f, 1.0f, 0.0f);
+ glTexCoord2f(0.0f, 0.0f); glVertex3f(a.x, a.y, a.z);
+ glTexCoord2f(1.0f, 0.0f); glVertex3f(b.x, b.y, b.z);
+ glTexCoord2f(1.0f, 1.0f); glVertex3f(c.x, c.y, c.z);
+ glTexCoord2f(0.0f, 1.0f); glVertex3f(d.x, d.y, d.z);
+ glEnd();
glDisable(GL_TEXTURE_2D);
}
// Draw a billboard (part of a texture defined by a rectangle)
-void DrawBillboardRec(Camera camera, Texture2D texture, Rectangle sourceRec, Vector3 basePos, float size, Color tint)
+void DrawBillboardRec(Camera camera, Texture2D texture, Rectangle sourceRec, Vector3 center, float size, Color tint)
{
- // NOTE: Billboard size will represent the width, height maintains aspect ratio
- //Vector3 centerPos = { basePos.x, basePos.y + size * (float)texture.height/(float)texture.width/2, basePos.z };
- //Vector2 sizeRatio = { size, size * (float)texture.height/texture.width };
- //Vector3 rotation = { 90, 0, 0 };
-
- // TODO: Calculate Y rotation to face always camera (use matrix)
- // OPTION: Lock Y-axis
-
- glEnable(GL_TEXTURE_2D);
+ // NOTE: Billboard size will maintain sourceRec aspect ratio, size will represent billboard width
+ Vector2 sizeRatio = { size, size * (float)sourceRec.height/sourceRec.width };
+
+ Matrix viewMatrix = MatrixLookAt(camera.position, camera.target, camera.up);
+ MatrixTranspose(&viewMatrix);
+
+ Vector3 right = { viewMatrix.m0, viewMatrix.m4, viewMatrix.m8 };
+ Vector3 up = { viewMatrix.m1, viewMatrix.m5, viewMatrix.m9 };
+/*
+ d-------c
+ | |
+ | * |
+ | |
+ a-------b
+*/
+ VectorScale(&right, sizeRatio.x/2);
+ VectorScale(&up, sizeRatio.y/2);
+
+ Vector3 p1 = VectorAdd(right, up);
+ Vector3 p2 = VectorSubtract(right, up);
+
+ Vector3 a = VectorSubtract(center, p2);
+ Vector3 b = VectorAdd(center, p1);
+ Vector3 c = VectorAdd(center, p2);
+ Vector3 d = VectorSubtract(center, p1);
+
+ glEnable(GL_TEXTURE_2D); // Enable textures usage
glBindTexture(GL_TEXTURE_2D, texture.glId);
- // TODO: DrawPlane with correct textcoords for source rec.
+ glBegin(GL_QUADS);
+ glColor4ub(tint.r, tint.g, tint.b, tint.a);
+
+ // Bottom-left corner for texture and quad
+ glTexCoord2f((float)sourceRec.x / texture.width, (float)sourceRec.y / texture.height);
+ glVertex3f(a.x, a.y, a.z);
+
+ // Bottom-right corner for texture and quad
+ glTexCoord2f((float)(sourceRec.x + sourceRec.width) / texture.width, (float)sourceRec.y / texture.height);
+ glVertex3f(b.x, b.y, b.z);
+
+ // Top-right corner for texture and quad
+ glTexCoord2f((float)(sourceRec.x + sourceRec.width) / texture.width, (float)(sourceRec.y + sourceRec.height) / texture.height);
+ glVertex3f(c.x, c.y, c.z);
+
+ // Top-left corner for texture and quad
+ glTexCoord2f((float)sourceRec.x / texture.width, (float)(sourceRec.y + sourceRec.height) / texture.height);
+ glVertex3f(d.x, d.y, d.z);
+ glEnd();
- glDisable(GL_TEXTURE_2D);
+ glDisable(GL_TEXTURE_2D); // Disable textures usage
}
// Get current vertex y altitude (proportional to pixel colors in grayscale)
static float GetHeightValue(Color pixel)
{
return (((float)pixel.r + (float)pixel.g + (float)pixel.b)/3);
+}
+
+// Returns camera look-at matrix (view matrix)
+static Matrix MatrixLookAt(Vector3 eye, Vector3 target, Vector3 up)
+{
+ Matrix result;
+
+ Vector3 z = VectorSubtract(eye, target);
+ VectorNormalize(&z);
+ Vector3 x = VectorCrossProduct(up, z);
+ VectorNormalize(&x);
+ Vector3 y = VectorCrossProduct(z, x);
+ VectorNormalize(&y);
+
+ result.m0 = x.x;
+ result.m1 = x.y;
+ result.m2 = x.z;
+ result.m3 = -((x.x * eye.x) + (x.y * eye.y) + (x.z * eye.z));
+ result.m4 = y.x;
+ result.m5 = y.y;
+ result.m6 = y.z;
+ result.m7 = -((y.x * eye.x) + (y.y * eye.y) + (y.z * eye.z));
+ result.m8 = z.x;
+ result.m9 = z.y;
+ result.m10 = z.z;
+ result.m11 = -((z.x * eye.x) + (z.y * eye.y) + (z.z * eye.z));
+ result.m12 = 0;
+ result.m13 = 0;
+ result.m14 = 0;
+ result.m15 = 1;
+
+ return result;
+}
+
+// Transposes provided matrix
+static void MatrixTranspose(Matrix *mat)
+{
+ Matrix temp;
+
+ temp.m0 = mat->m0;
+ temp.m1 = mat->m4;
+ temp.m2 = mat->m8;
+ temp.m3 = mat->m12;
+ temp.m4 = mat->m1;
+ temp.m5 = mat->m5;
+ temp.m6 = mat->m9;
+ temp.m7 = mat->m13;
+ temp.m8 = mat->m2;
+ temp.m9 = mat->m6;
+ temp.m10 = mat->m10;
+ temp.m11 = mat->m14;
+ temp.m12 = mat->m3;
+ temp.m13 = mat->m7;
+ temp.m14 = mat->m11;
+ temp.m15 = mat->m15;
+
+ *mat = temp;
} \ No newline at end of file
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