Pressing 1-4 loads a different sprite animation

animation.h

@@ -0,0 +1,24 @@
+#pragma once
+
+typedef struct {
+    char* name;
+    byte* imgData;
+    u16 animCount;
+    u16 width;
+    u16 height;
+} SpriteSheet;
+
+typedef struct {
+    char* name;
+    f32 posX;
+    f32 posY;
+    u16 rows;
+    u16 cols;
+    u16 width;
+    u16 height;
+} Animation;
+
+typedef struct {
+    float timeElapsed;
+    int frame;
+} AnimationPlayback;

lib.h

@@ -8,6 +8,7 @@
 typedef uint8_t   u8;
 // typedef char16_t  c16;
 typedef uint16_t  u16;
+typedef int16_t  i16;
 typedef int32_t   b32;
 typedef int32_t   i32;
 typedef uint32_t  u32;
@@ -19,16 +20,6 @@ typedef char      byte;
 typedef ptrdiff_t size;
 typedef size_t    usize;
 
-typedef struct Animation {
-    char* name;
-    u16 x_pos;
-    u16 y_pos;
-    u16 rows;
-    u16 cols;
-    u16 width;
-    u16 height;
-} Animation;
-
 typedef struct s8 {
     u8* data;
     usize size;

main.c

@@ -7,6 +7,7 @@
 #include "lib.h"
 #include "stb_image.h"
 #include "rendering.h"
+#include "animation.h"
 #include "libcyaml/include/cyaml/cyaml.h"
 
 #define PI 3.14159f
@@ -20,6 +21,7 @@ typedef struct State {
     float px;
     float py;
     int spriteY;
+    int currentAnim;
 } State;
 
 void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
@@ -35,11 +37,17 @@ void processInput(GLFWwindow *window, State* state) {
     }
 
     float amount = 1.0f;
-    if (glfwGetKey(window, GLFW_KEY_J) == GLFW_RELEASE) {
-        state->spriteY -= 1;
+    if (glfwGetKey(window, GLFW_KEY_1) == GLFW_PRESS) {
+        state->currentAnim = 0;
     }
-    if (glfwGetKey(window, GLFW_KEY_K) == GLFW_RELEASE) {
-        state->spriteY += 1;
+    if (glfwGetKey(window, GLFW_KEY_2) == GLFW_PRESS) {
+        state->currentAnim = 1;
+    }
+    if (glfwGetKey(window, GLFW_KEY_3) == GLFW_PRESS) {
+        state->currentAnim = 2;
+    }
+    if (glfwGetKey(window, GLFW_KEY_4) == GLFW_PRESS) {
+        state->currentAnim = 3;
     }
     if (glfwGetKey(window, GLFW_KEY_UP) == GLFW_PRESS) {
         state->camY -= amount;
@@ -53,7 +61,7 @@ void processInput(GLFWwindow *window, State* state) {
     if (glfwGetKey(window, GLFW_KEY_RIGHT) == GLFW_PRESS) {
         state->camX += amount;
     }
-    amount = 1.1f;
+    amount = 2.1f;
     if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
         state->py -= amount;
     }
@@ -128,13 +136,63 @@ int main(void) {
 
     unsigned int textureID;
     int width, height, channels;
-    char* data = (char*)stbi_load("assets/player.png", &width, &height, &channels, 4);
+    byte* data = (char*)stbi_load("assets/player.png", &width, &height, &channels, 4);
     // char* data = (char*)stbi_load("imports/sprites/player/idle.png", &width, &height, &channels, 4);
     if (data == NULL) {
         fprintf(stderr, "Could not load texture\n");
         return -1;
     }
 
+    SpriteSheet spriteSheet = {
+        .name = "player",
+        .imgData = data,
+        .animCount = 4,
+        .width = width,
+        .height = height,
+    };
+
+    Animation idle = {
+        .name   = "idle",
+        .posX   = 0,
+        .posY   = 0,
+        .rows   = 1,
+        .cols   = 10,
+        .width  = 48,
+        .height = 48,
+    };
+
+    Animation run = {
+        .name   = "run",
+        .posX   = 0,
+        .posY   = 48 * 3,
+        .rows   = 1,
+        .cols   = 8,
+        .width  = 48,
+        .height = 48,
+    };
+
+    Animation jump = {
+        .name   = "jump",
+        .posX   = 0,
+        .posY   = 48,
+        .rows   = 1,
+        .cols   = 3,
+        .width  = 48,
+        .height = 48,
+    };
+
+    Animation land = {
+        .name   = "land",
+        .posX   = 0,
+        .posY   = 48 * 2,
+        .rows   = 1,
+        .cols   = 9,
+        .width  = 48,
+        .height = 48,
+    };
+
+    Animation playerAnims[4] = {idle, run, jump, land};
+
     glGenTextures(1, &textureID);
     glActiveTexture(GL_TEXTURE0);
     glBindTexture(GL_TEXTURE_2D, textureID);
@@ -169,7 +227,6 @@ int main(void) {
 
         glUseProgram(shaderProgram);
 
-        // vec4 vec = {1.0f, 0.0f, 0.0f, 1.0f};
         mat4 model;
         mat4 projection;
         glm_mat4_identity(model);
@@ -179,10 +236,8 @@ int main(void) {
         glm_translate(model, (vec3){state.px, state.py, 0.0f});
         glm_translate(model, (vec3){0.f, 0.f, 0.0f});
         glm_translate(model, (vec3){pivotx, pivoty, 0.0f});
-        // glm_rotate(model, currentFrame, (vec3){0.0f, 0.0f, 1.0f});
         glm_scale(model, (vec3){100.0f, 100.0f, 0.0f});
         glm_translate(model, (vec3){-pivotx, -pivoty, 0.0f});
-        // printf("X:%f Y:%f Z:%f\n", projection[3][0], projection[3][1], projection[3][2]);
 
         float worldUnitSizeInPixels = 2; // Desired size of a 1x1 area on the screen
         float hw = (SCREEN_WIDTH / 2.f) / worldUnitSizeInPixels;
@@ -197,26 +252,56 @@ int main(void) {
         location = glGetUniformLocation(shaderProgram, "projection");
         glUniformMatrix4fv(location, 1, GL_FALSE, projection[0]);
 
-        location = glGetUniformLocation(shaderProgram, "spriteColor");
-        glUniform3f(location, 1.0f, 1.0f, 1.0f);
+        glUniform1i(glGetUniformLocation(shaderProgram, "image"), 0);
+
+        Animation anim = playerAnims[state.currentAnim];
 
         elapsed += deltaTime;
         if (elapsed >  0.1f) {
             frameCount += 1;
-            if (frameCount > 9) {
+            if (frameCount >= anim.cols) {
                 frameCount = 0;
             }
             elapsed = 0.0f;
         }
 
-        location = glGetUniformLocation(shaderProgram, "spriteX");
-        float spriteX = (float)frameCount / 10;
-        glUniform1f(location, spriteX);
+        location = glGetUniformLocation(shaderProgram, "posX");
+        glUniform1f(location, anim.posX);
 
-        location = glGetUniformLocation(shaderProgram, "spriteY");
-        glUniform1f(location, state.camY);
+        location = glGetUniformLocation(shaderProgram, "posY");
+        glUniform1f(location, anim.posY);
+
+        location = glGetUniformLocation(shaderProgram, "animRow");
+        glUniform1i(location, frameCount);
+
+        // We don't animate on the Y axis yet
+        location = glGetUniformLocation(shaderProgram, "animCol");
+        glUniform1i(location, 0);
+
+        location = glGetUniformLocation(shaderProgram, "rows");
+        glUniform1i(location, anim.rows);
+
+        location = glGetUniformLocation(shaderProgram, "cols");
+        glUniform1i(location, anim.cols);
+
+        location = glGetUniformLocation(shaderProgram, "spriteWidth");
+        glUniform1i(location, anim.width);
+
+        location = glGetUniformLocation(shaderProgram, "spriteHeight");
+        glUniform1i(location, anim.height);
+
+        location = glGetUniformLocation(shaderProgram, "atlasWidth");
+        glUniform1i(location, spriteSheet.width);
+
+        location = glGetUniformLocation(shaderProgram, "atlasHeight");
+        glUniform1i(location, spriteSheet.height);
+
+        // location = glGetUniformLocation(shaderProgram, "spriteColor");
+        // glUniform3f(location, 1.0f, 1.0f, 1.0f);
+
+        // SpriteSheet spriteSheet = spriteSheet;
+        // printf("%i\n", state.currentAnim);
 
-        glUniform1i(glGetUniformLocation(shaderProgram, "image"), 0);
 
         glActiveTexture(GL_TEXTURE0);
         glBindTexture(GL_TEXTURE_2D, textureID);

shaders/main.frag

@@ -3,20 +3,33 @@ in vec2 TexCoords;
 out vec4 color;
 
 uniform sampler2D image;
+
+uniform float posX;
+uniform float posY;
+uniform int animRow;
+uniform int animCol;
+uniform int rows;
+uniform int cols;
+uniform int spriteWidth;
+uniform int spriteHeight;
+uniform int atlasWidth;
+uniform int atlasHeight;
+
+// Unused for now
 uniform vec3 spriteColor;
-uniform float spriteX;
-uniform float spriteY;
 
 void main() {
-    float r = (48.0 / 512.0);
-    float x = TexCoords.x * r + (int(spriteX * 10)) * r;
-    // float y = TexCoords.y * r + (int(spriteY * 10)) * r;
-    float y = TexCoords.y * r;
+    float rw = (float(spriteWidth) / float(atlasWidth));
+    float rh = (float(spriteHeight) / float(atlasHeight));
+    float x = TexCoords.x * rw + posX + animRow * rw;
+    float y = TexCoords.y * rh + (posY / float(atlasHeight)) + animCol * rh;
 
     float minb = 0.005;
     float maxb = 0.995;
-    if (TexCoords.x <= minb || TexCoords.x >= maxb
-        || TexCoords.y <= minb || TexCoords.y >= maxb) {
+    bool drawDebugBorders =
+        TexCoords.x <= minb || TexCoords.x >= maxb
+        || TexCoords.y <= minb || TexCoords.y >= maxb;
+    if (drawDebugBorders) {
         color = vec4(1,0,0,1);
     } else {
         color = texture(image, vec2(x, y));